handle hotmail complaint

app/config.py

@@ -333,6 +333,8 @@ AlERT_WRONG_MX_RECORD_CUSTOM_DOMAIN = "custom_domain_mx_record_issue"
 # alert when a new alias is about to be created on a disabled directory
 ALERT_DIRECTORY_DISABLED_ALIAS_CREATION = "alert_directory_disabled_alias_creation"
 
+ALERT_HOTMAIL_COMPLAINT = "alert_hotmail_complaint"
+
 # <<<<< END ALERT EMAIL >>>>
 
 # Disable onboarding emails
@@ -393,3 +395,5 @@ except Exception:
 HIBP_API_KEYS = sl_getenv("HIBP_API_KEYS", list) or []
 
 NEWRELIC_CONFIG_PATH = os.environ.get("NEWRELIC_CONFIG_PATH")
+
+POSTMASTER = os.environ.get("POSTMASTER")

app/email/status.py

@@ -11,6 +11,8 @@ E206 = "250 SL E206 Out of office"
 # if mail_from is a IgnoreBounceSender, no need to send back a bounce report
 E207 = "250 SL E207 No bounce report"
 
+E208 = "250 SL E208 Hotmail complaint handled"
+
 # 4** errors
 # E401 = "421 SL E401 Retry later"
 E402 = "421 SL E402 Encryption failed - Retry later"

app/email_utils.py

@@ -567,6 +567,19 @@ def get_orig_message_from_bounce(msg: Message) -> Message:
             return part
 
 
+def get_orig_message_from_outlook_complaint(msg: Message) -> Message:
+    """parse the original email from Bounce"""
+    i = 0
+    for part in msg.walk():
+        i += 1
+
+        # 1st part is the container
+        # 2nd part is the empty body
+        # 3rd is original message
+        if i == 3:
+            return part
+
+
 def get_header_from_bounce(msg: Message, header: str) -> str:
     """using regex to get header value from bounce message
     get_orig_message_from_bounce is better. This should be the last option

email_handler.py

@@ -76,6 +76,8 @@ from app.config import (
     ENABLE_SPAM_ASSASSIN,
     BOUNCE_PREFIX_FOR_REPLY_PHASE,
     NEWRELIC_CONFIG_PATH,
+    POSTMASTER,
+    ALERT_HOTMAIL_COMPLAINT,
 )
 from app.email import status
 from app.email.rate_limit import rate_limited
@@ -112,6 +114,7 @@ from app.email_utils import (
     sanitize_header,
     get_queue_id,
     should_ignore_bounce,
+    get_orig_message_from_outlook_complaint,
 )
 from app.extensions import db
 from app.log import LOG, set_message_id
@@ -1279,6 +1282,37 @@ def handle_bounce_forward_phase(msg: Message, email_log: EmailLog):
         )
 
 
+def handle_hotmail_complaint(msg: Message):
+    """
+    Handle hotmail complaint sent to postmaster
+    """
+    orig_msg = get_orig_message_from_outlook_complaint(msg)
+    alias_address = orig_msg["To"]
+    alias = Alias.get_by(email=alias_address)
+
+    if not alias:
+        LOG.d("No alias for %s", alias_address)
+
+    user = alias.user
+    LOG.e("Handle hotmail complaint for %s %s", alias, user)
+
+    send_email_with_rate_control(
+        user,
+        ALERT_HOTMAIL_COMPLAINT,
+        user.email,
+        f"Hotmail abuse report",
+        render(
+            "transactional/hotmail-complaint.txt.jinja2",
+            alias=alias,
+        ),
+        render(
+            "transactional/hotmail-complaint.html",
+            alias=alias,
+        ),
+        max_nb_alert=2,
+    )
+
+
 def handle_bounce_reply_phase(envelope, msg: Message, email_log: EmailLog):
     """
     Handle reply phase bounce
@@ -1687,6 +1721,15 @@ def handle(envelope: Envelope) -> str:
         handle_transactional_bounce(envelope, rcpt_tos[0])
         return status.E205
 
+    if (
+        len(rcpt_tos) == 1
+        and mail_from == "staff@hotmail.com"
+        and rcpt_tos[0] == POSTMASTER
+    ):
+        LOG.w("Handle hotmail complaint")
+        handle_hotmail_complaint(msg)
+        return status.E208
+
     # Handle bounce
     if (
         len(rcpt_tos) == 1

templates/emails/transactional/hotmail-complaint.html

@@ -0,0 +1,33 @@
+{% extends "base.html" %}
+
+{% block content %}
+  {% call text() %}
+    This is SimpleLogin team. <br>
+    Hotmail has informed us about an email sent to <b>{{ alias.email }}</b> that might have been marked as spam.
+  {% endcall %}
+
+  {% call text() %}
+    Putting a forwarded email into Spam affects SimpleLogin email delivery, has a negative effect for all users and
+    is a violation of our terms and condition.
+  {% endcall %}
+
+  {% call text() %}
+    If that’s the case, please disable the alias instead if you don't want to receive the emails sent to this alias.
+  {% endcall %}
+
+  {% call text() %}
+    If SimpleLogin isn’t useful for you, please know that you can simply delete your account on the Settings page.
+  {% endcall %}
+
+  {% call text() %}
+    Looking to hear back from you.
+  {% endcall %}
+
+  {% call text() %}
+    Best, <br/>
+    SimpleLogin Team.
+  {% endcall %}
+
+{% endblock %}
+
+

templates/emails/transactional/hotmail-complaint.txt.jinja2

@@ -0,0 +1,17 @@
+Hi,
+
+This is SimpleLogin team.
+
+Hotmail has informed us about an email sent to {{ alias.email }} that might have been marked as spam.
+
+Putting a forwarded email into Spam affects SimpleLogin email delivery, has a negative effect for all users and
+  is a violation of our terms and condition.
+
+If that’s the case, please disable the alias instead if you don't want to receive the emails sent to this alias.
+
+If SimpleLogin isn’t useful for you, please know that you can simply delete your account on the Settings page.
+
+Looking to hear back from you.
+
+Best,
+SimpleLogin Team.