diff --git a/addons/mail/models/mail_template.py b/addons/mail/models/mail_template.py
index e647dfcf122..ca6500d9b2d 100644
--- a/addons/mail/models/mail_template.py
+++ b/addons/mail/models/mail_template.py
@@ -69,12 +69,22 @@ class MailTemplate(models.Model):
                                         help="Sidebar action to make this template available on records "
                                              "of the related document model")
 
+    # access
+    can_write = fields.Boolean(compute='_compute_can_write',
+                               help='The current user can edit the template.')
+
     # Overrides of mail.render.mixin
     @api.depends('model')
     def _compute_render_model(self):
         for template in self:
             template.render_model = template.model
 
+    @api.depends_context('uid')
+    def _compute_can_write(self):
+        writable_templates = self._filter_access_rules('write')
+        for template in self:
+            template.can_write = template in writable_templates
+
     # ------------------------------------------------------------
     # CRUD
     # ------------------------------------------------------------
diff --git a/addons/mail/static/src/scss/composer.scss b/addons/mail/static/src/scss/composer.scss
index 33a61c521ba..a7fc3eb484b 100644
--- a/addons/mail/static/src/scss/composer.scss
+++ b/addons/mail/static/src/scss/composer.scss
@@ -175,3 +175,10 @@
         background-color: rgba($white, 0.1);
     }
 }
+
+.o_mail_composer_form {
+    .oe-bordered-editor[name=body] .o_readonly {
+        border: 1px solid $o-gray-300;
+        padding: 4px;
+    }
+}
diff --git a/addons/mail/views/mail_template_views.xml b/addons/mail/views/mail_template_views.xml
index ee814dba4d2..664d09697f7 100644
--- a/addons/mail/views/mail_template_views.xml
+++ b/addons/mail/views/mail_template_views.xml
@@ -53,7 +53,10 @@
                                 <div class="oe_title">
                                     <h2 style="display: inline-block;"><field name="subject" placeholder='e.g. "Welcome to MyCompany" or "Nice to meet you, ${object.name}"'/></h2>
                                 </div>
-                                <field name="body_html" widget="html" class="oe-bordered-editor" options="{'style-inline': true, 'codeview': true }"/>
+                                <field name="can_write" invisible="1"/>
+                                <field name="body_html" widget="html" class="oe-bordered-editor"
+                                    options="{'style-inline': true, 'codeview': true }"
+                                    attrs="{'readonly': [('can_write', '=', False)]}"/>
                                 <field name="attachment_ids" widget="many2many_binary"/>
                             </page>
                             <page string="Email Configuration" name="email_configuration">
diff --git a/addons/mail/wizard/mail_compose_message_views.xml b/addons/mail/wizard/mail_compose_message_views.xml
index d785d7a1fb5..9114efd14b9 100644
--- a/addons/mail/wizard/mail_compose_message_views.xml
+++ b/addons/mail/wizard/mail_compose_message_views.xml
@@ -6,7 +6,7 @@
             <field name="model">mail.compose.message</field>
             <field name="groups_id" eval="[Command.link(ref('base.group_user'))]"/>
             <field name="arch" type="xml">
-                <form string="Compose Email" class="pt-0 pb-0">
+                <form string="Compose Email" class="pt-0 pb-0 o_mail_composer_form">
                     <group>
                         <!-- truly invisible fields for control and options -->
                         <field name="author_id" invisible="1"/>
diff --git a/addons/mail/wizard/mail_template_preview.py b/addons/mail/wizard/mail_template_preview.py
index 118fbf4fb93..e82cb90e0fe 100644
--- a/addons/mail/wizard/mail_template_preview.py
+++ b/addons/mail/wizard/mail_template_preview.py
@@ -24,10 +24,11 @@ class MailTemplatePreview(models.TransientModel):
         result = super(MailTemplatePreview, self).default_get(fields)
         if not result.get('mail_template_id') or 'resource_ref' not in fields:
             return result
-        mail_template = self.env['mail.template'].browse(result['mail_template_id'])
-        res = self.env[mail_template.model_id.model].search([], limit=1)
+        mail_template = self.env['mail.template'].browse(result['mail_template_id']).sudo()
+        model = mail_template.model
+        res = self.env[model].search([], limit=1)
         if res:
-            result['resource_ref'] = '%s,%s' % (mail_template.model_id.model, res.id)
+            result['resource_ref'] = '%s,%s' % (model, res.id)
         return result
 
     mail_template_id = fields.Many2one('mail.template', string='Related Mail Template', required=True)
@@ -52,8 +53,9 @@ class MailTemplatePreview(models.TransientModel):
 
     @api.depends('model_id')
     def _compute_no_record(self):
-        for preview in self:
-            preview.no_record = (self.env[preview.model_id.model].search_count([]) == 0) if preview.model_id else True
+        for preview, preview_sudo in zip(self, self.sudo()):
+            model_id = preview_sudo.model_id
+            preview.no_record = not model_id or not self.env[model_id.model].search_count([])
 
     @api.depends('lang', 'resource_ref')
     def _compute_mail_template_fields(self):
diff --git a/addons/survey/wizard/survey_invite_views.xml b/addons/survey/wizard/survey_invite_views.xml
index 834d4181cc9..9da8fdb2322 100644
--- a/addons/survey/wizard/survey_invite_views.xml
+++ b/addons/survey/wizard/survey_invite_views.xml
@@ -5,7 +5,7 @@
             <field name="name">survey.invite.view.form</field>
             <field name="model">survey.invite</field>
             <field name="arch" type="xml">
-                <form string="Compose Email">
+                <form string="Compose Email" class="o_mail_composer_form">
                     <group col="1">
                         <group col="2">
                             <field name="survey_access_mode" invisible="1"/>
diff --git a/addons/website_slides/wizard/slide_channel_invite_views.xml b/addons/website_slides/wizard/slide_channel_invite_views.xml
index 42a9cd87fd4..35f1a035953 100644
--- a/addons/website_slides/wizard/slide_channel_invite_views.xml
+++ b/addons/website_slides/wizard/slide_channel_invite_views.xml
@@ -5,7 +5,7 @@
             <field name="name">slide.channel.invite.view.form</field>
             <field name="model">slide.channel.invite</field>
             <field name="arch" type="xml">
-                <form string="Compose Email">
+                <form string="Compose Email" class="o_mail_composer_form">
                     <group col="1">
                         <group col="2">
                             <field name="channel_id" invisible="1"/>