Lothar Schilling:
> Hi everybody,
>
> amongst other duties I am the adminstrator of another organisation's
> small (samba) server. Each day this server will send me its logs via
> email. Sadly, more often than not those emails get discarded by our
> relay server. Sometimes they fall victim to smtpd_relay_restrictions
> (blacklisted with spamhaus), but mostly postscreen will kill them with
> its DNS blackhole lists.
>
> Problem is that the sending server has a dynamic IP address. So, is it
> possible to whitelist these mails, e.g. by a concise subject, before
> smtpd_relay_restrictions or postscreen will even get to see them?
Postscreen and smtpd_relay_restrictions ar IP-based and never see
email content. These hosts should not be exposed to any of that.
I suggest that these hosts not connect to the NTA service on port
25. Instead, they should connect to an MUA service port 587
(submission) or 465 (smtps, submissions) and authenticate with SASL
or TLS certificate. Properly configured MUA services do not use
postscreen or smtpd_relay_resitrctions.
Wietse
