diff --git a/addons/snailmail/i18n/snailmail.pot b/addons/snailmail/i18n/snailmail.pot
index abe2e48530c..548292bf5e2 100644
--- a/addons/snailmail/i18n/snailmail.pot
+++ b/addons/snailmail/i18n/snailmail.pot
@@ -4,10 +4,10 @@
 #
 msgid ""
 msgstr ""
-"Project-Id-Version: Odoo Server 12.0\n"
+"Project-Id-Version: Odoo Server 13.0alpha1+e\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2018-10-30 12:25+0000\n"
-"PO-Revision-Date: 2018-10-30 12:25+0000\n"
+"POT-Creation-Date: 2018-11-20 14:10+0000\n"
+"PO-Revision-Date: 2018-11-20 14:10+0000\n"
 "Last-Translator: <>\n"
 "Language-Team: \n"
 "MIME-Version: 1.0\n"
@@ -16,13 +16,18 @@ msgstr ""
 "Plural-Forms: \n"
 
 #. module: snailmail
-#: code:addons/snailmail/models/snailmail_letter.py:249
-#, python-format
-msgid "An error occured when sending the document by post.<br>Error: %s"
+#: model:ir.model.fields,field_description:snailmail.field_snailmail_letter__activity_id
+msgid "Activity"
 msgstr ""
 
 #. module: snailmail
-#: code:addons/snailmail/models/snailmail_letter.py:215
+#: code:addons/snailmail/models/snailmail_letter.py:268
+#, python-format
+msgid "An error occured when sending the document by post.<br>Error: %s <br>Go to 'Configuration > Management > Snailmail Letters' to see all letters awaiting dispatch to Snailmail."
+msgstr ""
+
+#. module: snailmail
+#: code:addons/snailmail/models/snailmail_letter.py:234
 #, python-format
 msgid "An unknown error happened. Please contact the support."
 msgstr ""
@@ -32,6 +37,11 @@ msgstr ""
 msgid "Attachment"
 msgstr ""
 
+#. module: snailmail
+#: model:ir.model.fields,field_description:snailmail.field_snailmail_letter__attachment_fname
+msgid "Attachment Filename"
+msgstr ""
+
 #. module: snailmail
 #: model:ir.model.fields,field_description:snailmail.field_snailmail_letter__duplex
 msgid "Both side"
@@ -103,6 +113,12 @@ msgstr ""
 msgid "Display Name"
 msgstr ""
 
+#. module: snailmail
+#: model:ir.model.fields,field_description:snailmail.field_snailmail_letter__attachment_datas
+#: model_terms:ir.ui.view,arch_db:snailmail.snailmail_letter_list
+msgid "Document"
+msgstr ""
+
 #. module: snailmail
 #: model:ir.model.fields,field_description:snailmail.field_snailmail_letter__res_id
 msgid "Document ID"
@@ -149,8 +165,6 @@ msgid "Last Updated on"
 msgstr ""
 
 #. module: snailmail
-#: model:ir.actions.act_window,name:snailmail.action_mail_letters
-#: model:ir.ui.menu,name:snailmail.menu_snailmail_letters
 #: model_terms:ir.ui.view,arch_db:snailmail.snailmail_letter_list
 msgid "Letters"
 msgstr ""
@@ -161,7 +175,7 @@ msgid "Model"
 msgstr ""
 
 #. module: snailmail
-#: code:addons/snailmail/models/snailmail_letter.py:211
+#: code:addons/snailmail/models/snailmail_letter.py:230
 #, python-format
 msgid "One or more required fields are empty."
 msgstr ""
@@ -172,7 +186,7 @@ msgid "Optional report to print and attach"
 msgstr ""
 
 #. module: snailmail
-#: code:addons/snailmail/models/snailmail_letter.py:264
+#: code:addons/snailmail/models/snailmail_letter.py:280
 #, python-format
 msgid "Post letter: an error occured."
 msgstr ""
@@ -202,6 +216,11 @@ msgstr ""
 msgid "Recipient"
 msgstr ""
 
+#. module: snailmail
+#: model:ir.model.fields,field_description:snailmail.field_snailmail_letter__reference
+msgid "Related Record"
+msgstr ""
+
 #. module: snailmail
 #: model:ir.model,name:snailmail.model_ir_actions_report
 msgid "Report Action"
@@ -217,11 +236,22 @@ msgstr ""
 msgid "Sent"
 msgstr ""
 
+#. module: snailmail
+#: model:ir.model.fields,field_description:snailmail.field_snailmail_letter__user_id
+msgid "Sent by"
+msgstr ""
+
 #. module: snailmail
 #: model:ir.model,name:snailmail.model_snailmail_letter
 msgid "Snailmail Letter"
 msgstr ""
 
+#. module: snailmail
+#: model:ir.actions.act_window,name:snailmail.action_mail_letters
+#: model:ir.ui.menu,name:snailmail.menu_snailmail_letters
+msgid "Snailmail Letters"
+msgstr ""
+
 #. module: snailmail
 #: model:ir.actions.server,name:snailmail.snailmail_print_ir_actions_server
 #: model:ir.cron,cron_name:snailmail.snailmail_print
@@ -235,28 +265,23 @@ msgid "Status"
 msgstr ""
 
 #. module: snailmail
-#: code:addons/snailmail/models/snailmail_letter.py:213
+#: code:addons/snailmail/models/snailmail_letter.py:232
 #, python-format
 msgid "The attachment of the letter could not be sent. Please check its content and contact the support if the problem persists."
 msgstr ""
 
 #. module: snailmail
-#: code:addons/snailmail/models/snailmail_letter.py:209
+#: code:addons/snailmail/models/snailmail_letter.py:228
 #, python-format
 msgid "The country of the partner is not covered by Snailmail."
 msgstr ""
 
 #. module: snailmail
-#: code:addons/snailmail/models/snailmail_letter.py:242
+#: code:addons/snailmail/models/snailmail_letter.py:261
 #, python-format
 msgid "The document was correctly sent by post.<br>The tracking id is %ssend_id"
 msgstr ""
 
-#. module: snailmail
-#: model:ir.model.fields,field_description:snailmail.field_snailmail_letter__user_id
-msgid "User sending the letter"
-msgstr ""
-
 #. module: snailmail
 #: model:ir.model.fields,help:snailmail.field_snailmail_letter__state
 msgid "When a letter is created, the status is 'Draft'.\n"
@@ -265,13 +290,14 @@ msgid "When a letter is created, the status is 'Draft'.\n"
 msgstr ""
 
 #. module: snailmail
-#: code:addons/snailmail/models/snailmail_letter.py:207
+#: code:addons/snailmail/models/snailmail_letter.py:226
 #, python-format
 msgid "You don't have an IAP account registered for this service.<br>Please go to <a href=%s target=\"new\">iap.odoo.com</a> to claim your free credits."
 msgstr ""
 
 #. module: snailmail
-#: code:addons/snailmail/models/snailmail_letter.py:204
+#: code:addons/snailmail/models/snailmail_letter.py:223
 #, python-format
 msgid "You don't have enough credits to perform this operation.<br>Please go to your <a href=%s target=\"new\">iap account</a>."
 msgstr ""
+
diff --git a/addons/snailmail/models/res_company.py b/addons/snailmail/models/res_company.py
index b51147b2ef1..25e694968da 100644
--- a/addons/snailmail/models/res_company.py
+++ b/addons/snailmail/models/res_company.py
@@ -6,5 +6,5 @@ from odoo import fields, models
 class Company(models.Model):
     _inherit = "res.company"
 
-    snailmail_color = fields.Boolean(string='Color', default=False)
+    snailmail_color = fields.Boolean(string='Color', default=True)
     snailmail_duplex = fields.Boolean(string='Both sides', default=False)
diff --git a/addons/snailmail/models/snailmail_letter.py b/addons/snailmail/models/snailmail_letter.py
index 2b57ff70a5a..1f8abe12ad2 100644
--- a/addons/snailmail/models/snailmail_letter.py
+++ b/addons/snailmail/models/snailmail_letter.py
@@ -18,7 +18,7 @@ class SnailmailLetter(models.Model):
     _name = 'snailmail.letter'
     _description = 'Snailmail Letter'
 
-    user_id = fields.Many2one('res.users', 'User sending the letter')
+    user_id = fields.Many2one('res.users', 'Sent by')
     model = fields.Char('Model', required=True)
     res_id = fields.Integer('Document ID', required=True)
     partner_id = fields.Many2one('res.partner', string='Recipient', required=True)
@@ -27,6 +27,9 @@ class SnailmailLetter(models.Model):
     report_template = fields.Many2one('ir.actions.report', 'Optional report to print and attach')
 
     attachment_id = fields.Many2one('ir.attachment', string='Attachment', ondelete='cascade')
+    attachment_datas = fields.Binary('Document', related='attachment_id.datas')
+    attachment_fname = fields.Char('Attachment Filename', related='attachment_id.datas_fname')
+    activity_id = fields.Many2one('mail.activity', string='Activity')
     color = fields.Boolean(string='Color', default=lambda self: self.env.user.company_id.snailmail_color)
     duplex = fields.Boolean(string='Both side', default=lambda self: self.env.user.company_id.snailmail_duplex)
     state = fields.Selection([
@@ -40,7 +43,23 @@ class SnailmailLetter(models.Model):
              "If the letter is correctly sent, the status goes in 'Sent',\n"
              "If not, it will got in state 'Error' and the error message will be displayed in the field 'Error Message'.")
     info_msg = fields.Char('Information')
+    display_name = fields.Char('Display Name', compute="_compute_display_name")
 
+    reference = fields.Char(string='Related Record', compute='_compute_reference', readonly=True, store=False)
+
+    @api.depends('reference', 'partner_id')
+    def _compute_display_name(self):
+        for letter in self:
+            if letter.attachment_id:
+                letter.display_name = "%s - %s" % (letter.attachment_id.name, letter.partner_id.name)
+            else:
+                letter.display_name = letter.partner_id.name
+
+    @api.depends('model', 'res_id')
+    def _compute_reference(self):
+        for res in self:
+            res.reference = "%s,%s" % (res.model, res.res_id)
+    
     @api.multi
     def _fetch_attachment(self):
         """
@@ -192,7 +211,7 @@ class SnailmailLetter(models.Model):
             'options': {
                 'color': self and self[0].color,
                 'duplex': self and self[0].duplex,
-                'currency_name': self and self[0].company_id.currency_id.name,
+                'currency_name': 'EUR',
             },
             # this will not raise the InsufficientCreditError which is the behaviour we want for now
             'batch': True,
@@ -245,7 +264,7 @@ class SnailmailLetter(models.Model):
             else:
                 # look for existing activities related to snailmail to update or create a new one.
                 # TODO: in following versions, Add a link to a specifc activity on the letter
-                note = _('An error occured when sending the document by post.<br>Error: %s' % \
+                note = _('An error occured when sending the document by post.<br>Error: %s <br>Go to \'Configuration > Management > Snailmail Letters\' to see all letters awaiting dispatch to Snailmail.' % \
                     self._get_error_message(doc['error'] if response['request_code'] == 200 else response['reason']))
 
                 domain = [
@@ -254,8 +273,7 @@ class SnailmailLetter(models.Model):
                     ('res_model_id', '=', self.env['ir.model']._get(letter.model).id),
                     ('activity_type_id', '=', self.env.ref('mail.mail_activity_data_warning').id),
                 ]
-                MailActivity = self.env['mail.activity']
-                activity = MailActivity.search(domain, limit=1)
+                activity = letter.activity_id
 
                 activity_data = {
                     'activity_type_id': self.env.ref('mail.mail_activity_data_warning').id,
@@ -271,7 +289,8 @@ class SnailmailLetter(models.Model):
                         'res_id': letter.res_id,
                         'res_model_id': self.env['ir.model']._get(letter.model).id,
                     })
-                    MailActivity.create(activity_data)
+                    activity = self.env['mail.activity'].create(activity_data)
+                    letter.write({'activity_id': activity.id})
 
                 letter.write({'info_msg': note, 'state': 'error'})
 
@@ -285,6 +304,11 @@ class SnailmailLetter(models.Model):
     def cancel(self):
         self.write({'state': 'canceled'})
 
+    @api.multi
+    def unlink(self):
+        self.mapped('activity_id').unlink()
+        return super(SnailmailLetter, self).unlink()
+
     @api.multi
     def _snailmail_estimate(self):
         """
diff --git a/addons/snailmail/views/snailmail_views.xml b/addons/snailmail/views/snailmail_views.xml
index 7a230c2f706..0462b1b70ee 100644
--- a/addons/snailmail/views/snailmail_views.xml
+++ b/addons/snailmail/views/snailmail_views.xml
@@ -5,11 +5,10 @@
         <field name="model">snailmail.letter</field>
         <field name="arch" type="xml">
             <tree decoration-danger="state=='error'" decoration-muted="state=='sent'" string="Letters">
-                <field name="attachment_id"/>
-                <field name="model"/>
-                <field name="res_id"/>
-                <field name="company_id"/>
-                <field name="state"/>
+                <field name="attachment_id" string="Document"/>
+                <field name="partner_id"/>
+                <field name="user_id"/>
+                <field name="state" invisible="1"/>
                 <field name="info_msg" widget="html"/>
             </tree>
         </field>
@@ -26,16 +25,22 @@
                     <field name="state" widget="statusbar" statusbar_visible="pending,sent,cancel"/>
                 </header>
                 <sheet>
+                    <div class="oe_title">
+                        <h1><field name="display_name" readonly="1"/></h1>
+                    </div>
                     <group>
-                        <field name="attachment_id"/>
-                        <field name="partner_id"/>
-                        <field name="user_id"/>
-                        <field name="model"/>
-                        <field name="res_id"/>
-                        <field name="color"/>
-                        <field name="duplex"/>
+                        <field name="reference" widget="reference" readonly="1"/>
+                        <field name="attachment_datas" filename="attachment_fname" readonly="1" />
+                        <field name="attachment_fname" invisible="1"/>
+                        <field name="partner_id" readonly="1"/> 
+                        <field name="user_id" readonly="1"/>
                         <field name="info_msg" widget="html" readonly="1"/>
-                        <field name="company_id"/>
+                    </group>
+                    <group groups="base.group_no_one">
+                        <field name="model" readonly="1"/>
+                        <field name="res_id" readonly="1"/>
+                        <field name="color" readonly="1"/>
+                        <field name="duplex" readonly="1"/>
                     </group>
                 </sheet>
             </form>
@@ -43,7 +48,7 @@
     </record>
 
     <record model="ir.actions.act_window" id="action_mail_letters">
-        <field name="name">Letters</field>
+        <field name="name">Snailmail Letters</field>
         <field name="res_model">snailmail.letter</field>
         <field name="view_type">form</field>
         <field name="view_mode">form,tree</field>
diff --git a/addons/snailmail_account/__manifest__.py b/addons/snailmail_account/__manifest__.py
index 5f71dd9eacf..67049f8dada 100644
--- a/addons/snailmail_account/__manifest__.py
+++ b/addons/snailmail_account/__manifest__.py
@@ -10,6 +10,8 @@ Allows users to send invoices by post
     'depends': ['account', 'snailmail'],
     'data': [
         'views/res_config_settings_views.xml',
+        'views/snailmail_views.xml',
+        'views/assets.xml',
         'wizard/account_invoice_send_views.xml',
     ],
     'auto_install': True,
diff --git a/addons/snailmail_account/i18n/snailmail_account.pot b/addons/snailmail_account/i18n/snailmail_account.pot
index 5f808e44312..4f5cdb05296 100644
--- a/addons/snailmail_account/i18n/snailmail_account.pot
+++ b/addons/snailmail_account/i18n/snailmail_account.pot
@@ -4,10 +4,10 @@
 #
 msgid ""
 msgstr ""
-"Project-Id-Version: Odoo Server 12.0\n"
+"Project-Id-Version: Odoo Server 13.0alpha1+e\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2018-11-05 09:29+0000\n"
-"PO-Revision-Date: 2018-11-05 09:29+0000\n"
+"POT-Creation-Date: 2018-11-20 14:11+0000\n"
+"PO-Revision-Date: 2018-11-20 14:11+0000\n"
 "Last-Translator: <>\n"
 "Language-Team: \n"
 "MIME-Version: 1.0\n"
@@ -15,6 +15,19 @@ msgstr ""
 "Content-Transfer-Encoding: \n"
 "Plural-Forms: \n"
 
+#. module: snailmail_account
+#: code:addons/snailmail_account/wizard/account_invoice_send.py:86
+#, python-format
+msgid "%s of the selected invoice(s) had an invalid address and were not sent"
+msgstr ""
+
+#. module: snailmail_account
+#: model_terms:ir.ui.view,arch_db:snailmail_account.account_invoice_send_inherit_account_wizard_form
+msgid "<span class=\"text-danger\">\n"
+"                                            Incomplete customer address\n"
+"                                        </span>"
+msgstr ""
+
 #. module: snailmail_account
 #: model_terms:ir.ui.view,arch_db:snailmail_account.account_invoice_send_inherit_account_wizard_form
 msgid "<span> to: </span>"
@@ -30,6 +43,13 @@ msgstr ""
 msgid "Allows to send the document by snail mail (coventional posting delivery service)"
 msgstr ""
 
+#. module: snailmail_account
+#: code:addons/snailmail_account/wizard/account_invoice_send.py:89
+#, python-format
+msgid "Cannot send by post to an incomplete address.\n"
+"                    Please update the customer's address or uncheck 'Send by Post'."
+msgstr ""
+
 #. module: snailmail_account
 #: model:ir.model,name:snailmail_account.model_res_company
 msgid "Companies"
@@ -41,8 +61,10 @@ msgid "Config Settings"
 msgstr ""
 
 #. module: snailmail_account
-#: model:ir.model.fields,field_description:snailmail_account.field_account_invoice_send__currency_id
-msgid "Currency"
+#: code:addons/snailmail_account/wizard/account_invoice_send.py:85
+#: model:ir.model.fields,field_description:snailmail_account.field_account_invoice_send__invalid_addresses
+#, python-format
+msgid "Invalid Addresses"
 msgstr ""
 
 #. module: snailmail_account
@@ -57,7 +79,7 @@ msgstr ""
 
 #. module: snailmail_account
 #: model_terms:ir.ui.view,arch_db:snailmail_account.res_config_settings_view_form
-msgid "Print In Color"
+msgid "Print in Color"
 msgstr ""
 
 #. module: snailmail_account
@@ -72,11 +94,27 @@ msgstr ""
 
 #. module: snailmail_account
 #: model:ir.model.fields,field_description:snailmail_account.field_account_invoice_send__snailmail_is_letter
-#: model:ir.model.fields,field_description:snailmail_account.field_res_config_settings__invoice_is_snailmail
 msgid "Send by Post"
 msgstr ""
 
+#. module: snailmail_account
+#: model:ir.model.fields,field_description:snailmail_account.field_res_config_settings__invoice_is_snailmail
+msgid "Send by Post with Snailmail"
+msgstr ""
+
+#. module: snailmail_account
+#: model:ir.actions.act_window,name:snailmail_account.action_mail_invoice_letters
+#: model:ir.ui.menu,name:snailmail_account.menu_snailmail_invoice_letters
+msgid "Snailmail Letters"
+msgstr ""
+
 #. module: snailmail_account
 #: model:ir.model.fields,field_description:snailmail_account.field_account_invoice_send__snailmail_cost
 msgid "Stamp(s)"
 msgstr ""
+
+#. module: snailmail_account
+#: model_terms:ir.ui.view,arch_db:snailmail_account.account_invoice_send_inherit_account_wizard_form
+msgid "invoice(s) do not have a complete customer address"
+msgstr ""
+
diff --git a/addons/snailmail_account/models/res_config_settings.py b/addons/snailmail_account/models/res_config_settings.py
index bab192ef4e1..d4608ac1d3d 100644
--- a/addons/snailmail_account/models/res_config_settings.py
+++ b/addons/snailmail_account/models/res_config_settings.py
@@ -7,4 +7,4 @@ from odoo import fields, models
 class ResConfigSettings(models.TransientModel):	
     _inherit = 'res.config.settings'	
 
-    invoice_is_snailmail = fields.Boolean(string='Send by Post', related='company_id.invoice_is_snailmail', readonly=False)
+    invoice_is_snailmail = fields.Boolean(string='Send by Post with Snailmail', related='company_id.invoice_is_snailmail', readonly=False)
diff --git a/addons/snailmail_account/static/src/js/snailmail_account_notification_manager.js b/addons/snailmail_account/static/src/js/snailmail_account_notification_manager.js
new file mode 100644
index 00000000000..8c42b17c6be
--- /dev/null
+++ b/addons/snailmail_account/static/src/js/snailmail_account_notification_manager.js
@@ -0,0 +1,35 @@
+odoo.define('snailmail_account.NotificationManager', function (require) {
+"use strict";
+
+var AbstractService = require('web.AbstractService');
+var core = require("web.core");
+
+var SnailmailNotificationManager =  AbstractService.extend({
+    dependencies: ['bus_service'],
+
+    /**
+     * @override
+     */
+    start: function () {
+        this._super.apply(this, arguments);
+        this.call('bus_service', 'onNotification', this, this._onNotification);
+    },
+
+    _onNotification: function (notifs) {
+        var self = this;
+        _.each(notifs, function (notif) {
+            var model = notif[0][1];
+            var type = notif[1].type;
+            if (model === 'res.partner' && type === 'snailmail_invalid_address') {
+                self.do_warn(notif[1].title,  notif[1].message);
+            }
+        });
+    }
+
+});
+
+core.serviceRegistry.add('snailmail_notification_service', SnailmailNotificationManager);
+
+return SnailmailNotificationManager;
+
+});
diff --git a/addons/snailmail_account/views/assets.xml b/addons/snailmail_account/views/assets.xml
new file mode 100644
index 00000000000..529d22849b1
--- /dev/null
+++ b/addons/snailmail_account/views/assets.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <template id="assets_backend" name="iap assets" inherit_id="web.assets_backend">
+        <xpath expr="." position="inside">
+            <script type="text/javascript" src="/snailmail_account/static/src/js/snailmail_account_notification_manager.js"></script>
+        </xpath>
+    </template>
+</odoo>
diff --git a/addons/snailmail_account/views/res_config_settings_views.xml b/addons/snailmail_account/views/res_config_settings_views.xml
index 53572a7c23d..2bb518f5f10 100644
--- a/addons/snailmail_account/views/res_config_settings_views.xml
+++ b/addons/snailmail_account/views/res_config_settings_views.xml
@@ -16,12 +16,12 @@
                         <span class="fa fa-lg fa-building-o" title="Values set here are company-specific."/>
                         <div class="content-group" attrs="{'invisible': [('invoice_is_snailmail' ,'=', False)]}">
                             <div class="mt16">
-                                <field name="snailmail_duplex" class="oe_inline"/>
-                                <label string="Print on Both Sides" class="o_light_label" for="snailmail_duplex"/>
+                                <field name="snailmail_color" class="oe_inline"/>
+                                <label string="Print in Color" class="o_light_label" for="snailmail_color"/>
                             </div>
                             <div>
-                                <field name="snailmail_color" class="oe_inline"/>
-                                <label string="Print In Color" class="o_light_label" for="snailmail_color"/>
+                                <field name="snailmail_duplex" class="oe_inline"/>
+                                <label string="Print on Both Sides" class="o_light_label" for="snailmail_duplex"/>
                             </div>
                         </div>
                     </div>
diff --git a/addons/snailmail_account/views/snailmail_views.xml b/addons/snailmail_account/views/snailmail_views.xml
new file mode 100644
index 00000000000..21880755771
--- /dev/null
+++ b/addons/snailmail_account/views/snailmail_views.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<odoo>
+
+    <record model="ir.actions.act_window" id="action_mail_invoice_letters">
+        <field name="name">Snailmail Letters</field>
+        <field name="res_model">snailmail.letter</field>
+        <field name="view_type">form</field>
+        <field name="view_mode">form,tree</field>
+        <field name="domain">[('state', '!=', 'draft'), ('model','=','account.invoice')]</field>
+        <field name="view_id" ref="snailmail.snailmail_letter_list" />
+    </record>
+    
+    <menuitem id="menu_snailmail_invoice_letters" parent="account.account_management_menu" action="action_mail_invoice_letters"
+              sequence="10"/>
+
+</odoo>
\ No newline at end of file
diff --git a/addons/snailmail_account/wizard/account_invoice_send.py b/addons/snailmail_account/wizard/account_invoice_send.py
index 4db249c3b5b..87c87a390a2 100644
--- a/addons/snailmail_account/wizard/account_invoice_send.py
+++ b/addons/snailmail_account/wizard/account_invoice_send.py
@@ -1,7 +1,8 @@
 # -*- coding: utf-8 -*-
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
-from odoo import api, fields, models
+from odoo import api, fields, models, _
+from odoo.exceptions import UserError
 
 
 class AccountInvoiceSend(models.TransientModel):
@@ -12,8 +13,20 @@ class AccountInvoiceSend(models.TransientModel):
     partner_id = fields.Many2one('res.partner', compute='_get_partner', string='Partner')
     snailmail_is_letter = fields.Boolean('Send by Post', help='Allows to send the document by snail mail (coventional posting delivery service)', default=lambda self: self.env.user.company_id.invoice_is_snailmail)
     snailmail_cost = fields.Float(string='Stamp(s)', compute='_snailmail_estimate', store=True, readonly=True)
-    currency_id = fields.Many2one('res.currency', compute='_get_invoice_currency', string="Currency")
     letter_ids = fields.Many2many('snailmail.letter', 'snailmail_letter_account_invoice_send_rel', ondelete='cascade')
+    invalid_addresses = fields.Integer('Invalid Addresses', compute='_compute_invalid_addresses')
+
+    @api.depends('snailmail_cost', 'letter_ids')
+    def _compute_invalid_addresses(self):
+        for wizard in self:
+            count_invalid_addresses = 0
+            required_fields = ['street', 'city', 'zip', 'country_id']
+            for letter in wizard.letter_ids:
+                for field in required_fields:
+                    if not letter.partner_id[field]:
+                        count_invalid_addresses += 1
+                        break
+            wizard.invalid_addresses = count_invalid_addresses
 
     @api.multi
     @api.onchange('invoice_ids')
@@ -72,6 +85,18 @@ class AccountInvoiceSend(models.TransientModel):
 
     @api.multi
     def send_and_print_action(self):
+        if self.snailmail_is_letter and self.invalid_addresses:
+            if self.composition_mode == "mass_mail":
+                self.env['bus.bus'].sendone(
+                            (self._cr.dbname, 'res.partner', self.env.user.partner_id.id),
+                            {'type': 'snailmail_invalid_address', 'title': _("Invalid Addresses"),
+                            'message': _("%s of the selected invoice(s) had an invalid address and were not sent") % self.invalid_addresses}
+                        )
+            else:
+                raise UserError(_(
+                    '''Cannot send by post to an incomplete address.
+                    Please update the customer's address or uncheck \'Send by Post\'.'''
+                ))
         res = super(AccountInvoiceSend, self).send_and_print_action()
         if self.snailmail_is_letter:
             self.snailmail_print_action()
diff --git a/addons/snailmail_account/wizard/account_invoice_send_views.xml b/addons/snailmail_account/wizard/account_invoice_send_views.xml
index 5fd58f436e6..f771712c36a 100644
--- a/addons/snailmail_account/wizard/account_invoice_send_views.xml
+++ b/addons/snailmail_account/wizard/account_invoice_send_views.xml
@@ -9,25 +9,44 @@
                 <xpath expr="//div[@name='option_email']" position='before'>
                     <div name="option_letter">
                         <field name="letter_ids" invisible="1"/>
+                        <field name="invalid_addresses" invisible="1"/>
                         <div name="option" class="text-left d-inline-block">
                             <field name="snailmail_is_letter" />
                             <b><label for="snailmail_is_letter"/></b>
                         </div>
-                        <div class="text-left d-inline-block mr8" name='cost' attrs="{'invisible': [('snailmail_is_letter','=', False)]}">
-                            <b>(
-                                <span>
-                                    <field name="snailmail_cost" options="{'digits':[0,0]}" class="mr4"/>
-                                    <label for="snailmail_cost" class="mr4"/>
+                        <span attrs="{'invisible': [('snailmail_is_letter','=', False)]}">
+                            <span class="mr4" attrs="{'invisible': [('snailmail_cost', '=', 0)]}">
+                                <b>(
+                                    <span>
+                                        <field name="snailmail_cost" options="{'digits':[0,0]}" class="mr4"/>
+                                        <label for="snailmail_cost" class="mr4"/>
+                                    </span>
+                                    <i class="fa fa-info-circle" role="img" aria-label="Warning" title="Make sure you have enough Stamps on your account."/>
+                                )</b>
+                            </span>
+                            <span attrs="{'invisible': [('composition_mode', '=', 'mass_mail')]}">
+                                <span attrs="{'invisible': [('invalid_addresses', '!=', 0)]}">
+                                    <div class="text-right text-muted d-inline-block" name="address">
+                                        <span> to: </span>
+                                        <field name="partner_id" readonly="1" force_save="1" context="{'show_address': 1, 'address_inline': 1}" options="{'always_reload': True, 'no_quick_create': True}"/>
+                                    </div>
                                 </span>
-                                <i class="fa fa-info-circle" role="img" aria-label="Warning" title="
-                                The letter will be sent using the IAP service from Odoo.&#10;Make sure you have enough credits on your account or proceed to a recharge.&#10;The price is estimated based on 1 page per document.
-                                "/>
-                            )</b>
-                        </div>
-                        <div class="text-right text-muted d-inline-block" name="address" attrs="{'invisible': ['|', ('composition_mode', '=', 'mass_mail'), ('snailmail_is_letter','=', False)]}">
-                            <span> to: </span>
-                            <field name="partner_id" readonly="1" force_save="1" context="{'show_address': 1, 'address_inline': 1}" options="{'always_reload': True, 'no_quick_create': True}"/>
-                        </div>
+                                <span attrs="{'invisible': [('invalid_addresses', '=', 0)]}">
+                                    <div class="text-right d-inline-block" attrs="{'invisible': [('composition_mode', '=', 'mass_mail')]}">
+                                        <span class="text-danger">
+                                            Incomplete customer address
+                                        </span>
+                                    </div>
+                                </span>
+                            </span>
+                            <span attrs="{'invisible': [('composition_mode', '!=', 'mass_mail')]}">
+                                <span attrs="{'invisible': [('snailmail_cost', '=', 0)]}">
+                                    <span class="text-danger" attrs="{'invisible': [('invalid_addresses', '=', 0)]}">
+                                        <field name="invalid_addresses" readonly="1" options="{'digits':[0,0]}"/>  invoice(s) do not have a complete customer address
+                                    </span>
+                                </span>
+                            </span>
+                        </span>
                     </div>
                 </xpath>
                 <xpath expr="//footer/button[hasclass('send_and_print')]" position='attributes'>