Merge #2543

2543: Fix #2231: make public announcements work r=nextgens a=nextgens

## What type of PR?

bug-fix

## What does this PR do?

Ensure public announcements bypass filters.

They can still time-out... but this is already a big improvement that we should be able to backport.

### Related issue(s)
- closes #2231

## Prerequisites
Before we can consider review and merge, please make sure the following list is done and checked.
If an entry in not applicable, you can check it or remove it from the list.

- [ ] In case of feature or enhancement: documentation updated accordingly
- [x] Unless it's docs or a minor change: add [changelog](https://mailu.io/master/contributors/workflow.html#changelog) entry file.


Co-authored-by: Florent Daigniere <nextgens@freenetproject.org>

core/admin/mailu/models.py

@@ -2,7 +2,6 @@
 """
 
 import os
-import smtplib
 import json
 
 from datetime import date
@@ -420,14 +419,19 @@ class Email(object):
 
     def sendmail(self, subject, body):
         """ send an email to the address """
+        try:
             f_addr = f'{app.config["POSTMASTER"]}@{idna.encode(app.config["DOMAIN"]).decode("ascii")}'
-        with smtplib.SMTP(app.config['HOST_AUTHSMTP'], port=10025) as smtp:
+            ip, port = app.config['HOST_LMTP'].rsplit(':')
+            with smtplib.LMTP(ip, port=port) as lmtp:
                 to_address = f'{self.localpart}@{idna.encode(self.domain_name).decode("ascii")}'
                 msg = text.MIMEText(body)
                 msg['Subject'] = subject
                 msg['From'] = f_addr
                 msg['To'] = to_address
-            smtp.sendmail(f_addr, [to_address], msg.as_string())
+                lmtp.sendmail(f_addr, [to_address], msg.as_string())
+            return True
+        except smtplib.SMTPException:
+            return False
 
     @classmethod
     def resolve_domain(cls, email):

core/admin/mailu/ui/views/base.py

@@ -21,8 +21,9 @@ def announcement():
     form = forms.AnnouncementForm()
     if form.validate_on_submit():
         for user in models.User.query.all():
-            user.sendmail(form.announcement_subject.data,
-                form.announcement_body.data)
+            if not user.sendmail(form.announcement_subject.data,
+                    form.announcement_body.data):
+                flask.flash('Failed to send to %s' % user.email, 'error')
         # Force-empty the form
         form.announcement_subject.data = ''
         form.announcement_body.data = ''

towncrier/newsfragments/2231.bugfix

@@ -0,0 +1 @@
+Make public announcement bypass the filters. They may still time-out before being sent if there is a large number of users.