[Rspamd-Users] Skip FORGED_RECIPIENTS on mail polled by fetchmail

[Gerald Galster]

> a user has the local mailbox local at example.com and another mailbox
> some_other at example.net at a different provider. The latter is polled by
> fetchmail which feeds the mail into the local mailbox. Such mail is
> penalized by rspamd with FORGED_RECIPIENTS because the MIME recipient
> some_other at example.net differs from the SMTP recipient
> local at example.com. While it is technically correct to do so, in this
> special case the difference between MIME and SMTP recipient is not an
> indication for spam but by design. Therefore I would like rspamd to skip
> this recipient check for such mail. How can that be accomplished?

In addition to Achim's hints, there may be more trouble waiting if
fetchmail delivers from non-local addresses, like direct spf violation.

It might be sufficient to multimap/prefilter/accept the ip address
fetchmail is bound to, e.g. if it runs inside a container or virtual
machine.

In case you are running dovecot or another lmtp capable mail store
backend, another option is to completely skip rspamd processing
and let fetchmail deliver directly via lmtp to the mail store.
You should also take into account legal aspects when meddling with
emails that have already been delivered to an external and final
destination, that you are just going to fetch for convenience.

Best regards,
Gerald