On 2025-08-19 18:55:17 +0300 (+0300), Odhiambo Washington via Mailman-users wrote: [...]
I believe I need to strengthen my rspamd to reject spam at SMTP time.
[...]
This is highly recommended anyway. Rejecting it after it gets provisionally accepted for local delivery to Mailman results in backscatter that is almost always to innocent spoofed addresses and not the actual spammer (which will then get your list server flagged as a spam source too), or to undeliverable addresses that will cause the bounces to sit in your deferred outbound queue and get periodically retried until they eventually expire.
If you've already accepted mail into your local delivery queue, the only sensible thing that can be done later in the pipeline is to silently discard (or at most log) it once detected.
-- Jeremy Stanley
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