Add unsub link to newsletters (#1455)

* Add unsub link to newsletters

* Remove debug statement

* Updated unsub link

* Update unsub style

* Format

Co-authored-by: Adrià Casajús <adria.casajus@proton.ch>

app/newsletter_utils.py

@@ -30,7 +30,9 @@ def send_newsletter_to_user(newsletter, user) -> (bool, str):
             html_template.render(
                 user=user,
                 URL=URL,
+                unsubscribe_link=unsubscribe_link,
             ),
+            unsubscribe_link=unsubscribe_link,
         )
 
         NewsletterUser.create(newsletter_id=newsletter.id, user_id=user.id, commit=True)

templates/emails/com/newsletter.html

@@ -0,0 +1,12 @@
+{% extends "base.html" %}
+
+{% block footer %}
+
+  <p class="f-fallback sub align-center"
+     style="font-size: 13px;
+            line-height: 1.625;
+            text-align: center;
+            margin: .4em 0 1.1875em;">
+    <a href="{{ unsubscribe_link }}">Unsubscribe from our newsletter</a>
+  </p>
+{% endblock %}