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diff --git a/addons/mail/wizard/mail_compose_message.py b/addons/mail/wizard/mail_compose_message.py
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+++ b/addons/mail/wizard/mail_compose_message.py
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+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+import ast
+import base64
+import re
+
+from odoo import _, api, fields, models, tools
+from odoo.exceptions import UserError
+
+
+# main mako-like expression pattern
+EXPRESSION_PATTERN = re.compile('(\$\{.+?\})')
+
+
+def _reopen(self, res_id, model, context=None):
+    # save original model in context, because selecting the list of available
+    # templates requires a model in context
+    context = dict(context or {}, default_model=model)
+    return {'type': 'ir.actions.act_window',
+            'view_mode': 'form',
+            'res_id': res_id,
+            'res_model': self._name,
+            'target': 'new',
+            'context': context,
+            }
+
+
+class MailComposer(models.TransientModel):
+    """ Generic message composition wizard. You may inherit from this wizard
+        at model and view levels to provide specific features.
+
+        The behavior of the wizard depends on the composition_mode field:
+        - 'comment': post on a record. The wizard is pre-populated via ``get_record_data``
+        - 'mass_mail': wizard in mass mailing mode where the mail details can
+            contain template placeholders that will be merged with actual data
+            before being sent to each recipient.
+    """
+    _name = 'mail.compose.message'
+    _description = 'Email composition wizard'
+    _log_access = True
+    _batch_size = 500
+
+    @api.model
+    def default_get(self, fields):
+        """ Handle composition mode. Some details about context keys:
+            - comment: default mode, model and ID of a record the user comments
+                - default_model or active_model
+                - default_res_id or active_id
+            - mass_mail: model and IDs of records the user mass-mails
+                - active_ids: record IDs
+                - default_model or active_model
+        """
+        result = super(MailComposer, self).default_get(fields)
+
+        # author
+        missing_author = 'author_id' in fields and 'author_id' not in result
+        missing_email_from = 'email_from' in fields and 'email_from' not in result
+        if missing_author or missing_email_from:
+            author_id, email_from = self.env['mail.thread']._message_compute_author(result.get('author_id'), result.get('email_from'), raise_exception=False)
+            if missing_email_from:
+                result['email_from'] = email_from
+            if missing_author:
+                result['author_id'] = author_id
+
+        if 'model' in fields and 'model' not in result:
+            result['model'] = self._context.get('active_model')
+        if 'res_id' in fields and 'res_id' not in result:
+            result['res_id'] = self._context.get('active_id')
+        if 'no_auto_thread' in fields and 'no_auto_thread' not in result and result.get('model'):
+            # doesn't support threading
+            if result['model'] not in self.env or not hasattr(self.env[result['model']], 'message_post'):
+                result['no_auto_thread'] = True
+
+        if 'active_domain' in self._context:  # not context.get() because we want to keep global [] domains
+            result['active_domain'] = '%s' % self._context.get('active_domain')
+        if result.get('composition_mode') == 'comment' and (set(fields) & set(['model', 'res_id', 'partner_ids', 'record_name', 'subject'])):
+            result.update(self.get_record_data(result))
+
+        filtered_result = dict((fname, result[fname]) for fname in result if fname in fields)
+        return filtered_result
+
+    # content
+    subject = fields.Char('Subject')
+    body = fields.Html('Contents', default='', sanitize_style=True)
+    parent_id = fields.Many2one(
+        'mail.message', 'Parent Message', index=True, ondelete='set null',
+        help="Initial thread message.")
+    template_id = fields.Many2one(
+        'mail.template', 'Use template', index=True,
+        domain="[('model', '=', model)]")
+    attachment_ids = fields.Many2many(
+        'ir.attachment', 'mail_compose_message_ir_attachments_rel',
+        'wizard_id', 'attachment_id', 'Attachments')
+    layout = fields.Char('Layout', copy=False)  # xml id of layout
+    add_sign = fields.Boolean(default=True)
+    # origin
+    email_from = fields.Char('From', help="Email address of the sender. This field is set when no matching partner is found and replaces the author_id field in the chatter.")
+    author_id = fields.Many2one(
+        'res.partner', 'Author', index=True,
+        help="Author of the message. If not set, email_from may hold an email address that did not match any partner.")
+    # composition
+    composition_mode = fields.Selection(selection=[
+        ('comment', 'Post on a document'),
+        ('mass_mail', 'Email Mass Mailing'),
+        ('mass_post', 'Post on Multiple Documents')], string='Composition mode', default='comment')
+    model = fields.Char('Related Document Model', index=True)
+    res_id = fields.Integer('Related Document ID', index=True)
+    record_name = fields.Char('Message Record Name', help="Name get of the related document.")
+    use_active_domain = fields.Boolean('Use active domain')
+    active_domain = fields.Text('Active domain', readonly=True)
+    # characteristics
+    message_type = fields.Selection([
+        ('comment', 'Comment'),
+        ('notification', 'System notification')],
+        'Type', required=True, default='comment',
+        help="Message type: email for email message, notification for system "
+             "message, comment for other messages such as user replies")
+    subtype_id = fields.Many2one(
+        'mail.message.subtype', 'Subtype', ondelete='set null', index=True,
+        default=lambda self: self.env['ir.model.data'].xmlid_to_res_id('mail.mt_comment'))
+    mail_activity_type_id = fields.Many2one(
+        'mail.activity.type', 'Mail Activity Type',
+        index=True, ondelete='set null')
+    # destination
+    reply_to = fields.Char('Reply-To', help='Reply email address. Setting the reply_to bypasses the automatic thread creation.')
+    no_auto_thread = fields.Boolean(
+        'No threading for answers',
+        help='Answers do not go in the original document discussion thread. This has an impact on the generated message-id.')
+    is_log = fields.Boolean('Log an Internal Note',
+                            help='Whether the message is an internal note (comment mode only)')
+    partner_ids = fields.Many2many(
+        'res.partner', 'mail_compose_message_res_partner_rel',
+        'wizard_id', 'partner_id', 'Additional Contacts',
+        domain=[('type', '!=', 'private')])
+    # mass mode options
+    notify = fields.Boolean('Notify followers', help='Notify followers of the document (mass post only)')
+    auto_delete = fields.Boolean('Delete Emails',
+        help='This option permanently removes any track of email after it\'s been sent, including from the Technical menu in the Settings, in order to preserve storage space of your Odoo database.')
+    auto_delete_message = fields.Boolean('Delete Message Copy', help='Do not keep a copy of the email in the document communication history (mass mailing only)')
+    mail_server_id = fields.Many2one('ir.mail_server', 'Outgoing mail server')
+
+    @api.model
+    def get_record_data(self, values):
+        """ Returns a defaults-like dict with initial values for the composition
+        wizard when sending an email related a previous email (parent_id) or
+        a document (model, res_id). This is based on previously computed default
+        values. """
+        result, subject = {}, False
+        if values.get('parent_id'):
+            parent = self.env['mail.message'].browse(values.get('parent_id'))
+            result['record_name'] = parent.record_name,
+            subject = tools.ustr(parent.subject or parent.record_name or '')
+            if not values.get('model'):
+                result['model'] = parent.model
+            if not values.get('res_id'):
+                result['res_id'] = parent.res_id
+            partner_ids = values.get('partner_ids', list()) + parent.partner_ids.ids
+            result['partner_ids'] = partner_ids
+        elif values.get('model') and values.get('res_id'):
+            doc_name_get = self.env[values.get('model')].browse(values.get('res_id')).name_get()
+            result['record_name'] = doc_name_get and doc_name_get[0][1] or ''
+            subject = tools.ustr(result['record_name'])
+
+        re_prefix = _('Re:')
+        if subject and not (subject.startswith('Re:') or subject.startswith(re_prefix)):
+            subject = "%s %s" % (re_prefix, subject)
+        result['subject'] = subject
+
+        return result
+
+    # ------------------------------------------------------------
+    # ACTIONS
+    # ------------------------------------------------------------
+    # action buttons call with positionnal arguments only, so we need an intermediary function
+    # to ensure the context is passed correctly
+    def action_send_mail(self):
+        self.send_mail()
+        return {'type': 'ir.actions.act_window_close'}
+
+    def send_mail(self, auto_commit=False):
+        """ Process the wizard content and proceed with sending the related
+            email(s), rendering any template patterns on the fly if needed. """
+        notif_layout = self._context.get('custom_layout')
+        # Several custom layouts make use of the model description at rendering, e.g. in the
+        # 'View <document>' button. Some models are used for different business concepts, such as
+        # 'purchase.order' which is used for a RFQ and and PO. To avoid confusion, we must use a
+        # different wording depending on the state of the object.
+        # Therefore, we can set the description in the context from the beginning to avoid falling
+        # back on the regular display_name retrieved in '_notify_prepare_template_context'.
+        model_description = self._context.get('model_description')
+        for wizard in self:
+            # Duplicate attachments linked to the email.template.
+            # Indeed, basic mail.compose.message wizard duplicates attachments in mass
+            # mailing mode. But in 'single post' mode, attachments of an email template
+            # also have to be duplicated to avoid changing their ownership.
+            if wizard.attachment_ids and wizard.composition_mode != 'mass_mail' and wizard.template_id:
+                new_attachment_ids = []
+                for attachment in wizard.attachment_ids:
+                    if attachment in wizard.template_id.attachment_ids:
+                        new_attachment_ids.append(attachment.copy({'res_model': 'mail.compose.message', 'res_id': wizard.id}).id)
+                    else:
+                        new_attachment_ids.append(attachment.id)
+                new_attachment_ids.reverse()
+                wizard.write({'attachment_ids': [(6, 0, new_attachment_ids)]})
+
+            # Mass Mailing
+            mass_mode = wizard.composition_mode in ('mass_mail', 'mass_post')
+
+            ActiveModel = self.env[wizard.model] if wizard.model and hasattr(self.env[wizard.model], 'message_post') else self.env['mail.thread']
+            if wizard.composition_mode == 'mass_post':
+                # do not send emails directly but use the queue instead
+                # add context key to avoid subscribing the author
+                ActiveModel = ActiveModel.with_context(mail_notify_force_send=False, mail_create_nosubscribe=True)
+            # wizard works in batch mode: [res_id] or active_ids or active_domain
+            if mass_mode and wizard.use_active_domain and wizard.model:
+                res_ids = self.env[wizard.model].search(ast.literal_eval(wizard.active_domain)).ids
+            elif mass_mode and wizard.model and self._context.get('active_ids'):
+                res_ids = self._context['active_ids']
+            else:
+                res_ids = [wizard.res_id]
+
+            batch_size = int(self.env['ir.config_parameter'].sudo().get_param('mail.batch_size')) or self._batch_size
+            sliced_res_ids = [res_ids[i:i + batch_size] for i in range(0, len(res_ids), batch_size)]
+
+            if wizard.composition_mode == 'mass_mail' or wizard.is_log or (wizard.composition_mode == 'mass_post' and not wizard.notify):  # log a note: subtype is False
+                subtype_id = False
+            elif wizard.subtype_id:
+                subtype_id = wizard.subtype_id.id
+            else:
+                subtype_id = self.env['ir.model.data'].xmlid_to_res_id('mail.mt_comment')
+
+            for res_ids in sliced_res_ids:
+                # mass mail mode: mail are sudo-ed, as when going through get_mail_values
+                # standard access rights on related records will be checked when browsing them
+                # to compute mail values. If people have access to the records they have rights
+                # to create lots of emails in sudo as it is consdiered as a technical model.
+                batch_mails_sudo = self.env['mail.mail'].sudo()
+                all_mail_values = wizard.get_mail_values(res_ids)
+                for res_id, mail_values in all_mail_values.items():
+                    if wizard.composition_mode == 'mass_mail':
+                        batch_mails_sudo |= self.env['mail.mail'].sudo().create(mail_values)
+                    else:
+                        post_params = dict(
+                            message_type=wizard.message_type,
+                            subtype_id=subtype_id,
+                            email_layout_xmlid=notif_layout,
+                            add_sign=not bool(wizard.template_id),
+                            mail_auto_delete=wizard.template_id.auto_delete if wizard.template_id else self._context.get('mail_auto_delete', True),
+                            model_description=model_description)
+                        post_params.update(mail_values)
+                        if ActiveModel._name == 'mail.thread':
+                            if wizard.model:
+                                post_params['model'] = wizard.model
+                                post_params['res_id'] = res_id
+                            if not ActiveModel.message_notify(**post_params):
+                                # if message_notify returns an empty record set, no recipients where found.
+                                raise UserError(_("No recipient found."))
+                        else:
+                            ActiveModel.browse(res_id).message_post(**post_params)
+
+                if wizard.composition_mode == 'mass_mail':
+                    batch_mails_sudo.send(auto_commit=auto_commit)
+
+    def get_mail_values(self, res_ids):
+        """Generate the values that will be used by send_mail to create mail_messages
+        or mail_mails. """
+        self.ensure_one()
+        results = dict.fromkeys(res_ids, False)
+        rendered_values = {}
+        mass_mail_mode = self.composition_mode == 'mass_mail'
+
+        # render all template-based value at once
+        if mass_mail_mode and self.model:
+            rendered_values = self.render_message(res_ids)
+        # compute alias-based reply-to in batch
+        reply_to_value = dict.fromkeys(res_ids, None)
+        if mass_mail_mode and not self.no_auto_thread:
+            records = self.env[self.model].browse(res_ids)
+            reply_to_value = records._notify_get_reply_to(default=self.email_from)
+
+        blacklisted_rec_ids = set()
+        if mass_mail_mode and issubclass(type(self.env[self.model]), self.pool['mail.thread.blacklist']):
+            self.env['mail.blacklist'].flush(['email'])
+            self._cr.execute("SELECT email FROM mail_blacklist WHERE active=true")
+            blacklist = {x[0] for x in self._cr.fetchall()}
+            if blacklist:
+                targets = self.env[self.model].browse(res_ids).read(['email_normalized'])
+                # First extract email from recipient before comparing with blacklist
+                blacklisted_rec_ids.update(target['id'] for target in targets
+                                           if target['email_normalized'] in blacklist)
+
+        for res_id in res_ids:
+            # static wizard (mail.message) values
+            mail_values = {
+                'subject': self.subject,
+                'body': self.body or '',
+                'parent_id': self.parent_id and self.parent_id.id,
+                'partner_ids': [partner.id for partner in self.partner_ids],
+                'attachment_ids': [attach.id for attach in self.attachment_ids],
+                'author_id': self.author_id.id,
+                'email_from': self.email_from,
+                'record_name': self.record_name,
+                'no_auto_thread': self.no_auto_thread,
+                'mail_server_id': self.mail_server_id.id,
+                'mail_activity_type_id': self.mail_activity_type_id.id,
+            }
+
+            # mass mailing: rendering override wizard static values
+            if mass_mail_mode and self.model:
+                record = self.env[self.model].browse(res_id)
+                mail_values['headers'] = record._notify_email_headers()
+                # keep a copy unless specifically requested, reset record name (avoid browsing records)
+                mail_values.update(notification=not self.auto_delete_message, model=self.model, res_id=res_id, record_name=False)
+                # auto deletion of mail_mail
+                if self.auto_delete or self.template_id.auto_delete:
+                    mail_values['auto_delete'] = True
+                # rendered values using template
+                email_dict = rendered_values[res_id]
+                mail_values['partner_ids'] += email_dict.pop('partner_ids', [])
+                mail_values.update(email_dict)
+                if not self.no_auto_thread:
+                    mail_values.pop('reply_to')
+                    if reply_to_value.get(res_id):
+                        mail_values['reply_to'] = reply_to_value[res_id]
+                if self.no_auto_thread and not mail_values.get('reply_to'):
+                    mail_values['reply_to'] = mail_values['email_from']
+                # mail_mail values: body -> body_html, partner_ids -> recipient_ids
+                mail_values['body_html'] = mail_values.get('body', '')
+                mail_values['recipient_ids'] = [(4, id) for id in mail_values.pop('partner_ids', [])]
+
+                # process attachments: should not be encoded before being processed by message_post / mail_mail create
+                mail_values['attachments'] = [(name, base64.b64decode(enc_cont)) for name, enc_cont in email_dict.pop('attachments', list())]
+                attachment_ids = []
+                for attach_id in mail_values.pop('attachment_ids'):
+                    new_attach_id = self.env['ir.attachment'].browse(attach_id).copy({'res_model': self._name, 'res_id': self.id})
+                    attachment_ids.append(new_attach_id.id)
+                attachment_ids.reverse()
+                mail_values['attachment_ids'] = self.env['mail.thread'].with_context(attached_to=record)._message_post_process_attachments(
+                    mail_values.pop('attachments', []),
+                    attachment_ids,
+                    {'model': 'mail.message', 'res_id': 0}
+                )['attachment_ids']
+                # Filter out the blacklisted records by setting the mail state to cancel -> Used for Mass Mailing stats
+                if res_id in blacklisted_rec_ids:
+                    mail_values['state'] = 'cancel'
+                    # Do not post the mail into the recipient's chatter
+                    mail_values['notification'] = False
+
+            results[res_id] = mail_values
+        return results
+
+    # ------------------------------------------------------------
+    # TEMPLATES
+    # ------------------------------------------------------------
+
+    @api.onchange('template_id')
+    def onchange_template_id_wrapper(self):
+        self.ensure_one()
+        values = self.onchange_template_id(self.template_id.id, self.composition_mode, self.model, self.res_id)['value']
+        for fname, value in values.items():
+            setattr(self, fname, value)
+
+    def onchange_template_id(self, template_id, composition_mode, model, res_id):
+        """ - mass_mailing: we cannot render, so return the template values
+            - normal mode: return rendered values
+            /!\ for x2many field, this onchange return command instead of ids
+        """
+        if template_id and composition_mode == 'mass_mail':
+            template = self.env['mail.template'].browse(template_id)
+            fields = ['subject', 'body_html', 'email_from', 'reply_to', 'mail_server_id']
+            values = dict((field, getattr(template, field)) for field in fields if getattr(template, field))
+            if template.attachment_ids:
+                values['attachment_ids'] = [att.id for att in template.attachment_ids]
+            if template.mail_server_id:
+                values['mail_server_id'] = template.mail_server_id.id
+        elif template_id:
+            values = self.generate_email_for_composer(
+                template_id, [res_id],
+                ['subject', 'body_html', 'email_from', 'email_to', 'partner_to', 'email_cc',  'reply_to', 'attachment_ids', 'mail_server_id']
+            )[res_id]
+            # transform attachments into attachment_ids; not attached to the document because this will
+            # be done further in the posting process, allowing to clean database if email not send
+            attachment_ids = []
+            Attachment = self.env['ir.attachment']
+            for attach_fname, attach_datas in values.pop('attachments', []):
+                data_attach = {
+                    'name': attach_fname,
+                    'datas': attach_datas,
+                    'res_model': 'mail.compose.message',
+                    'res_id': 0,
+                    'type': 'binary',  # override default_type from context, possibly meant for another model!
+                }
+                attachment_ids.append(Attachment.create(data_attach).id)
+            if values.get('attachment_ids', []) or attachment_ids:
+                values['attachment_ids'] = [(6, 0, values.get('attachment_ids', []) + attachment_ids)]
+        else:
+            default_values = self.with_context(default_composition_mode=composition_mode, default_model=model, default_res_id=res_id).default_get(['composition_mode', 'model', 'res_id', 'parent_id', 'partner_ids', 'subject', 'body', 'email_from', 'reply_to', 'attachment_ids', 'mail_server_id'])
+            values = dict((key, default_values[key]) for key in ['subject', 'body', 'partner_ids', 'email_from', 'reply_to', 'attachment_ids', 'mail_server_id'] if key in default_values)
+
+        if values.get('body_html'):
+            values['body'] = values.pop('body_html')
+
+        # This onchange should return command instead of ids for x2many field.
+        values = self._convert_to_write(values)
+
+        return {'value': values}
+
+    def save_as_template(self):
+        """ hit save as template button: current form value will be a new
+            template attached to the current document. """
+        for record in self:
+            model = self.env['ir.model']._get(record.model or 'mail.message')
+            model_name = model.name or ''
+            template_name = "%s: %s" % (model_name, tools.ustr(record.subject))
+            values = {
+                'name': template_name,
+                'subject': record.subject or False,
+                'body_html': record.body or False,
+                'model_id': model.id or False,
+                'attachment_ids': [(6, 0, [att.id for att in record.attachment_ids])],
+            }
+            template = self.env['mail.template'].create(values)
+            # generate the saved template
+            record.write({'template_id': template.id})
+            record.onchange_template_id_wrapper()
+            return _reopen(self, record.id, record.model, context=self._context)
+
+    # ------------------------------------------------------------
+    # RENDERING
+    # ------------------------------------------------------------
+
+    def render_message(self, res_ids):
+        """Generate template-based values of wizard, for the document records given
+        by res_ids. This method is meant to be inherited by email_template that
+        will produce a more complete dictionary, using Jinja2 templates.
+
+        Each template is generated for all res_ids, allowing to parse the template
+        once, and render it multiple times. This is useful for mass mailing where
+        template rendering represent a significant part of the process.
+
+        Default recipients are also computed, based on mail_thread method
+        _message_get_default_recipients. This allows to ensure a mass mailing has
+        always some recipients specified.
+
+        :param browse wizard: current mail.compose.message browse record
+        :param list res_ids: list of record ids
+
+        :return dict results: for each res_id, the generated template values for
+                              subject, body, email_from and reply_to
+        """
+        self.ensure_one()
+        multi_mode = True
+        if isinstance(res_ids, int):
+            multi_mode = False
+            res_ids = [res_ids]
+
+        subjects = self.env['mail.render.mixin']._render_template(self.subject, self.model, res_ids)
+        bodies = self.env['mail.render.mixin']._render_template(self.body, self.model, res_ids, post_process=True)
+        emails_from = self.env['mail.render.mixin']._render_template(self.email_from, self.model, res_ids)
+        replies_to = self.env['mail.render.mixin']._render_template(self.reply_to, self.model, res_ids)
+        default_recipients = {}
+        if not self.partner_ids:
+            records = self.env[self.model].browse(res_ids).sudo()
+            default_recipients = records._message_get_default_recipients()
+
+        results = dict.fromkeys(res_ids, False)
+        for res_id in res_ids:
+            results[res_id] = {
+                'subject': subjects[res_id],
+                'body': bodies[res_id],
+                'email_from': emails_from[res_id],
+                'reply_to': replies_to[res_id],
+            }
+            results[res_id].update(default_recipients.get(res_id, dict()))
+
+        # generate template-based values
+        if self.template_id:
+            template_values = self.generate_email_for_composer(
+                self.template_id.id, res_ids,
+                ['email_to', 'partner_to', 'email_cc', 'attachment_ids', 'mail_server_id'])
+        else:
+            template_values = {}
+
+        for res_id in res_ids:
+            if template_values.get(res_id):
+                # recipients are managed by the template
+                results[res_id].pop('partner_ids', None)
+                results[res_id].pop('email_to', None)
+                results[res_id].pop('email_cc', None)
+                # remove attachments from template values as they should not be rendered
+                template_values[res_id].pop('attachment_ids', None)
+            else:
+                template_values[res_id] = dict()
+            # update template values by composer values
+            template_values[res_id].update(results[res_id])
+
+        return multi_mode and template_values or template_values[res_ids[0]]
+
+    @api.model
+    def generate_email_for_composer(self, template_id, res_ids, fields):
+        """ Call email_template.generate_email(), get fields relevant for
+            mail.compose.message, transform email_cc and email_to into partner_ids """
+        multi_mode = True
+        if isinstance(res_ids, int):
+            multi_mode = False
+            res_ids = [res_ids]
+
+        returned_fields = fields + ['partner_ids', 'attachments']
+        values = dict.fromkeys(res_ids, False)
+
+        template_values = self.env['mail.template'].with_context(tpl_partners_only=True).browse(template_id).generate_email(res_ids, fields)
+        for res_id in res_ids:
+            res_id_values = dict((field, template_values[res_id][field]) for field in returned_fields if template_values[res_id].get(field))
+            res_id_values['body'] = res_id_values.pop('body_html', '')
+            values[res_id] = res_id_values
+
+        return multi_mode and values or values[res_ids[0]]
+
+    @api.autovacuum
+    def _gc_lost_attachments(self):
+        """ Garbage collect lost mail attachments. Those are attachments
+            - linked to res_model 'mail.compose.message', the composer wizard
+            - with res_id 0, because they were created outside of an existing
+                wizard (typically user input through Chatter or reports
+                created on-the-fly by the templates)
+            - unused since at least one day (create_date and write_date)
+        """
+        limit_date = fields.Datetime.subtract(fields.Datetime.now(), days=1)
+        self.env['ir.attachment'].search([
+            ('res_model', '=', self._name),
+            ('res_id', '=', 0),
+            ('create_date', '<', limit_date),
+            ('write_date', '<', limit_date)]
+        ).unlink()