diff --git a/addons/portal/controllers/mail.py b/addons/portal/controllers/mail.py
index 4ee2414548a..3a59ecd70b3 100644
--- a/addons/portal/controllers/mail.py
+++ b/addons/portal/controllers/mail.py
@@ -8,13 +8,12 @@ from odoo.http import request
 from odoo.tools import consteq
 
 
-def _special_access_object(res_model, res_id, token='', token_field=''):
+def _has_token_access(res_model, res_id, token=''):
     record = request.env[res_model].browse(res_id).sudo()
-    if token and record and getattr(record, token_field, None) and consteq(getattr(record, token_field), token):
-        return True
-    return False
+    token_field = request.env[res_model]._mail_post_token_field
+    return (token and record and consteq(record[token_field], token))
 
-def _message_post_helper(res_model='', res_id=None, message='', token='', token_field='token', nosubscribe=True, **kw):
+def _message_post_helper(res_model='', res_id=None, message='', token='', nosubscribe=True, **kw):
     """ Generic chatter function, allowing to write on *any* object that inherits mail.thread.
         If a token is specified, all logged in users will be able to write a message regardless
         of access rights; if the user is the public user, the message will be posted under the name
@@ -27,15 +26,14 @@ def _message_post_helper(res_model='', res_id=None, message='', token='', token_
         optional keywords arguments:
         :param string token: access token if the object's model uses some kind of public access
                              using tokens (usually a uuid4) to bypass access rules
-        :param string token_field: name of the field that contains the token on the object (defaults to 'token')
         :param bool nosubscribe: set False if you want the partner to be set as follower of the object when posting (default to True)
 
         The rest of the kwargs are passed on to message_post()
     """
     record = request.env[res_model].browse(res_id)
     author_id = request.env.user.partner_id.id if request.env.user.partner_id else False
-    if token_field and token:
-        access_as_sudo = _special_access_object(res_model, res_id, token=token, token_field=token_field)
+    if token:
+        access_as_sudo = _has_token_access(res_model, res_id, token=token)
         if access_as_sudo:
             record = record.sudo()
             if request.env.user == request.env.ref('base.public_user'):
@@ -46,6 +44,7 @@ def _message_post_helper(res_model='', res_id=None, message='', token='', token_
         else:
             raise Forbidden()
     kw.pop('csrf_token', None)
+    kw.pop('attachment_ids', None)
     return record.with_context(mail_create_nosubscribe=nosubscribe).message_post(body=message,
                                                                                    message_type=kw.pop('message_type', "comment"),
                                                                                    subtype=kw.pop('subtype', "mt_comment"),
@@ -93,7 +92,7 @@ class PortalChatter(http.Controller):
         # Check access
         Message = request.env['mail.message']
         if kw.get('token'):
-            access_as_sudo = _special_access_object(res_model, res_id, token=kw.get('token'), token_field=kw.get('token_field'))
+            access_as_sudo = _has_token_access(res_model, res_id, token=kw.get('token'))
             if not access_as_sudo:  # if token is not correct, raise Forbidden
                 raise Forbidden()
             Message = request.env['mail.message'].sudo()
diff --git a/addons/portal/models/mail_thread.py b/addons/portal/models/mail_thread.py
index 08cd54aa301..947839bc093 100644
--- a/addons/portal/models/mail_thread.py
+++ b/addons/portal/models/mail_thread.py
@@ -7,6 +7,8 @@ from odoo import api, fields, models
 class MailThread(models.AbstractModel):
     _inherit = 'mail.thread'
 
+    _mail_post_token_field = 'access_token' # token field for external posts, to be overridden
+
     website_message_ids = fields.One2many('mail.message', 'res_id', string='Website Messages',
         domain=lambda self: [('model', '=', self._name), ('message_type', '=', 'comment')], auto_join=True,
         help="Website communication history")
diff --git a/addons/portal/static/src/js/portal_chatter.js b/addons/portal/static/src/js/portal_chatter.js
index 8e9868ad825..6e1dfdafb1f 100644
--- a/addons/portal/static/src/js/portal_chatter.js
+++ b/addons/portal/static/src/js/portal_chatter.js
@@ -135,12 +135,10 @@ var PortalChatter = Widget.extend({
             'offset': (this._current_page-1) * this.options['pager_step'],
             'allow_composer': this.options['allow_composer'],
         };
-        // add fields to allow to post comment without being logged
-        _.each(['token', 'token_field'], function(field){
-            if(self.options[field]){
-                data[field] = self.options[field];
-            }
-        });
+        // add token field to allow to post comment without being logged
+        if(self.options['token']){
+            data['token'] = self.options['token'];
+        }
         // add domain
         if(this.get('domain')){
             data['domain'] = this.get('domain');
diff --git a/addons/portal/static/src/xml/portal_chatter.xml b/addons/portal/static/src/xml/portal_chatter.xml
index c4cfca119e0..71a7088c3cc 100644
--- a/addons/portal/static/src/xml/portal_chatter.xml
+++ b/addons/portal/static/src/xml/portal_chatter.xml
@@ -35,7 +35,6 @@
                                 <input type='hidden' name="token" t-att-value="widget.options['token']" t-if="widget.options['token']"/>
                                 <input type='hidden' name="sha_in" t-att-value="widget.options['sha_in']" t-if="widget.options['sha_in']"/>
                                 <input type='hidden' name="sha_time" t-att-value="widget.options['sha_time']" t-if="widget.options['sha_time']"/>
-                                <input type='hidden' name="token_field" t-att-value="widget.options['token_field']" t-if="widget.options['token_field']"/>
                                 <div class="alert alert-danger mt8 mb0 o_portal_chatter_composer_error" style="display:none;">
                                     Oops! Something went wrong. Try to reload the page and log in.
                                 </div>
diff --git a/addons/portal/views/portal_templates.xml b/addons/portal/views/portal_templates.xml
index ce5ca4c2951..80b864183fd 100644
--- a/addons/portal/views/portal_templates.xml
+++ b/addons/portal/views/portal_templates.xml
@@ -346,11 +346,10 @@
             :token string (optional): if you want your chatter to be available for non-logged user,
                      you can use a token to verify the identity of the user;
                      the message will be posted with the identity of the partner_id of the object
-            :token_field string (optional): name of the field that contains the token on the object (default to 'token')
     -->
     <template id="message_thread">
         <div id="discussion" class="hidden-print o_portal_chatter"
-            t-att-data-token="token" t-att-data-res_model="object._name" t-att-data-res_id="object.id" t-att-data-token_field="token_field" t-att-data-pager_step="message_per_page or 10" t-att-data-allow_composer="'0' if disable_composer else '1'">
+            t-att-data-token="token" t-att-data-res_model="object._name" t-att-data-res_id="object.id" t-att-data-pager_step="message_per_page or 10" t-att-data-allow_composer="'0' if disable_composer else '1'">
         </div>
     </template>
 
diff --git a/addons/sale/controllers/portal.py b/addons/sale/controllers/portal.py
index baf3078d87a..01fa9c04121 100644
--- a/addons/sale/controllers/portal.py
+++ b/addons/sale/controllers/portal.py
@@ -221,7 +221,7 @@ class CustomerPortal(CustomerPortal):
             res_id=order_sudo.id,
             message=_('Order signed by %s') % (partner_name,),
             attachments=[('signature.png', base64.b64decode(signature))] if signature else [],
-            **({'token': access_token, 'token_field': 'access_token'} if access_token else {}))
+            **({'token': access_token} if access_token else {}))
         return {
             'success': _('Your Order has been confirmed.'),
             'redirect_url': '/my/orders/%s?%s' % (order_sudo.id, access_token and 'access_token=%s' % order_sudo.access_token or ''),
diff --git a/addons/website_quote/controllers/main.py b/addons/website_quote/controllers/main.py
index f34a8298160..d29c34180df 100644
--- a/addons/website_quote/controllers/main.py
+++ b/addons/website_quote/controllers/main.py
@@ -55,7 +55,7 @@ class sale_quote(http.Controller):
         if Order and request.session.get('view_quote') != now and request.env.user.share:
             request.session['view_quote'] = now
             body = _('Quotation viewed by customer')
-            _message_post_helper(res_model='sale.order', res_id=Order.id, message=body, token=token, token_field="access_token", message_type='notification', subtype="mail.mt_note", partner_ids=Order.user_id.sudo().partner_id.ids)
+            _message_post_helper(res_model='sale.order', res_id=Order.id, message=body, token=token, message_type='notification', subtype="mail.mt_note", partner_ids=Order.user_id.sudo().partner_id.ids)
         if not Order:
             return request.render('website.404')
 
@@ -124,7 +124,7 @@ class sale_quote(http.Controller):
         Order.action_cancel()
         message = post.get('decline_message')
         if message:
-            _message_post_helper(message=message, res_id=order_id, res_model='sale.order', **{'token': token, 'token_field': 'access_token'} if token else {})
+            _message_post_helper(message=message, res_id=order_id, res_model='sale.order', **{'token': token} if token else {})
         return werkzeug.utils.redirect("/quote/%s/%s?message=2" % (order_id, token))
 
     @http.route(['/quote/update_line'], type='json', auth="public", website=True)
diff --git a/addons/website_quote/views/website_quote_templates.xml b/addons/website_quote/views/website_quote_templates.xml
index c27bbf4fcd1..e231caea6c0 100644
--- a/addons/website_quote/views/website_quote_templates.xml
+++ b/addons/website_quote/views/website_quote_templates.xml
@@ -397,7 +397,6 @@
           <!-- Options:Quotation Chatter: user can reply -->
           <t t-call="portal.message_thread">
             <t t-set="object" t-value="quotation"/>
-            <t t-set="token_field" t-value="'access_token'"/>
           </t>
       </xpath>
       <xpath expr="//a[@data-target='#modaldecline']" position="before">