Nov. 4, 2025
3:20 p.m.
If "my-mail-server-IP" is in fact your mail server's IP, then you may have a problem: spammers may be using your server as a relay for spoofed emails. It is also possible, or even likely that these are the result of bad actors maliciously requesting subscriptions for 3rd parties. Since this is a 421 status, these mails should remain queued in your mail server for a while and can be examined[1]. If this is the case, you may be able to mitigate this by setting SHOW_ANONYMOUS_SUBSCRIBE_FORM = False in your Django settings. See https://docs.mailman3.org/projects/postorius/en/latest/news.html#news-1-3-9 [1] For example if your MTA is Postfix postcat /var/spool/deferred/4/4d08rT4xMHzMCD6S and if that shows a subscription or email verification request postsuper -d 4d08rT4xMHzMCD6S to delete it so it isn't retried.
this is most likely the case. I tried adding the setting in Django as suggested but it doesnot seem to work. I see the documentation is for Postorius 1.3.9 but my version is 1.3.8 I suppose I need to upgrade Postorius