create a notification for a bounce email

app/models.py

@@ -1,4 +1,5 @@
 import enum
+import os
 import random
 import uuid
 from email.utils import formataddr
@@ -11,6 +12,7 @@ from email_validator import validate_email
 from flanker.addresslib import address
 from flask import url_for
 from flask_login import UserMixin
+from jinja2 import FileSystemLoader, Environment
 from sqlalchemy import orm
 from sqlalchemy import text, desc, CheckConstraint, Index, Column
 from sqlalchemy.dialects.postgresql import TSVECTOR
@@ -33,6 +35,7 @@ from app.config import (
     ALIAS_RANDOM_SUFFIX_LENGTH,
     MAX_NB_SUBDOMAIN,
     MAX_NB_DIRECTORY,
+    ROOT_DIR,
 )
 from app.db import Session
 from app.errors import (
@@ -2563,6 +2566,20 @@ class Notification(Base, ModelMixin):
     # whether user has marked the notification as read
     read = sa.Column(sa.Boolean, nullable=False, default=False)
 
+    @staticmethod
+    def render(template_name, **kwargs) -> str:
+        templates_dir = os.path.join(ROOT_DIR, "templates")
+        env = Environment(loader=FileSystemLoader(templates_dir))
+
+        template = env.get_template(template_name)
+
+        return template.render(
+            URL=URL,
+            LANDING_PAGE_URL=LANDING_PAGE_URL,
+            YEAR=arrow.now().year,
+            **kwargs,
+        )
+
 
 class SLDomain(Base, ModelMixin):
     """SimpleLogin domains"""

email_handler.py

@@ -149,6 +149,7 @@ from app.models import (
     MessageIDMatching,
     DeletedAlias,
     DomainDeletedAlias,
+    Notification,
 )
 from app.pgp_utils import PGPException, sign_data_with_pgpy, sign_data
 from app.utils import sanitize_email
@@ -1396,6 +1397,21 @@ def handle_bounce_forward_phase(msg: Message, email_log: EmailLog):
         )
         disable_alias_link = f"{URL}/dashboard/unsubscribe/{alias.id}"
         block_sender_link = f"{URL}/dashboard/alias_contact_manager/{alias.id}?highlight_contact_id={contact.id}"
+
+        Notification.create(
+            user_id=user.id,
+            title=f"Email from {contact.website_email} to {alias.email} cannot be delivered to {mailbox.email}",
+            message=Notification.render(
+                "notification/bounce-forward-phase.html",
+                alias=alias,
+                website_email=contact.website_email,
+                disable_alias_link=disable_alias_link,
+                refused_email_url=refused_email.get_url(),
+                mailbox_email=mailbox.email,
+                block_sender_link=block_sender_link,
+            ),
+            commit=True,
+        )
         send_email_with_rate_control(
             user,
             ALERT_BOUNCE_EMAIL,

templates/header.html

@@ -34,8 +34,9 @@
             <div v-if="loading">Loading ...</div>
             <div class="dropdown-item d-flex" v-for="notification in notifications">
               <div class="flex-grow-1">
-                <div v-html="notification.title" class="font-weight-bold" />
-                </div>
+                <div v-html="notification.title" class="font-weight-bold" style="width: 40em; word-wrap:break-word; white-space: normal; overflow: hidden;"></div>
+
+
 
                 <div v-html="notification.message"
                      style="width: 40em; word-wrap:break-word; white-space: normal; overflow: hidden; max-height: 100px; text-overflow: ellipsis;">

templates/notification/bounce-forward-phase.html

@@ -0,0 +1,36 @@
+<div>
+  This is usually because your mailbox service thinks the email is <b>spam</b>.
+</div>
+
+<a href="{{ refused_email_url }}" class="btn btn-primary">
+  View the bounced email
+</a>
+
+<div>
+  The email is automatically deleted in 7 days.
+</div>
+
+<div>
+  Please consider the following options: <br>
+
+  <ol>
+    <li>If the email is not spam, you can create a
+      <a href="https://simplelogin.io/docs/getting-started/troubleshooting/">filter</a>
+      to explicitly allow all emails from SimpleLogin. <br>
+    </li>
+
+    <li>
+      If this email is indeed spam, it means your alias {{ alias.email }} is now in the hands of a spammer.
+      You can either <a href="{{ disable_alias_link }}">disable the alias</a>
+      or <a href="{{ block_sender_link }}">block the sender</a> if they send too many spams.
+    </li>
+  </ol>
+
+
+</div>
+
+<div class="alert alert-warning">
+  Please note that the alias can be automatically disabled if too many emails sent to it are bounced.
+</div>
+
+