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diff --git a/addons/mass_mailing/models/mail_render_mixin.py b/addons/mass_mailing/models/mail_render_mixin.py
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+++ b/addons/mass_mailing/models/mail_render_mixin.py
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+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import api, models
+
+
+class MailRenderMixin(models.AbstractModel):
+    _inherit = "mail.render.mixin"
+
+    @api.model
+    def _render_template_postprocess(self, rendered):
+        # super will transform relative url to absolute
+        rendered = super(MailRenderMixin, self)._render_template_postprocess(rendered)
+
+        # apply shortener after
+        if self.env.context.get('post_convert_links'):
+            for res_id, html in rendered.items():
+                rendered[res_id] = self._shorten_links(
+                    html,
+                    self.env.context['post_convert_links'],
+                    blacklist=['/unsubscribe_from_list', '/view']
+                )
+        return rendered