Michael Grimm via Postfix-users:
> [FreeBSD 14-STABLE, postfix 3.8.4, dovecot 2.3.21, rspamd 3.7.5]
>
> Hi
>
> Sometimes outgoing mail is deferred due to "reputational issues"
> at the receiving side. These "reputational issues" mostly concerned
> my IP6 addresses, thus I removed IP6 mailing completely. But now,
> I do want to give it a try, again.
If it's just Google related, then you can try this to avoid
their IPv6 addresses.
/etc/postfix/main.cf:
smtp_dns_reply_filter = pcre:/etc/postfix/smtp_dns_reply_filter
/etc/postfix/smtp_dns_reply_filter:
# /domain ttl IN AAAA address/ action, all case-insensitive.
# Note: the domain name ends in ".".
/^\S+\.google.com\.\s+\S+\s+\S+\s+AAAA\s+/ IGNORE
That's what I have been using for the past 10 years.
> In the past, whenever a mail has been deferred, I manually modified
> inet_protocols to the protocol *not* involved, restarted postfix
> and ran 'postqueue -f'. After having the "reputational issue"
> solved, I returned to inet_protocols=all.
>
> Question: Is there a better way to achieve this (automatically)
> what I call "fallback to another protocol if receiver provides
> both"?
Perhaps you can use smtp_delivery_status_filter to turn rputation
related 5XX (reject) replies into into 4XX (defer) replies.
/etc/postfix/main.cf:
smtp_delivery_status_filter = pcre:/etc/postfix/smtp_dsn_filter
/etc/postfix/smtp_dsn_filter:
/^5(\.\d+\.\d+ .+ blah reputation blah .+)/ 4$1
With that, Postfix will try other IP addresses.
Postfix has a "rule based language" for receiving mail, but there
is no such thing for outbound deliveries.
Wietse
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