On 11/3/25 04:18, Stephen J. Turnbull wrote:
Paul via Mailman-users writes:
Iam getting alot of such from my mail server mail queue lately 4d08rT4xMHzMCD6S 2393 Mon Nov 3 01:43:21 list-bounces+makeupbymichelle=aol.com@lists.mydomain (host mx-aol.mail.gm0.yahoodns.net[67.195.228.84] said: 421 4.7.0 [TSS04] Messages from my-mail-server-IP temporarily deferred due to unexpected volume or user complaints - 4.16.55.1
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.
-- Mark Sapiro <mark@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan