Wietse Venema via Postfix-users <postfix-users@postfix.org> wrote: > Michael Grimm via Postfix-users:
>> 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. No, not only. All major Mail providers in Germany once in a while complained about my IP6 addresses. But I always succeeded in getting them whitelisted again. But this normally takes some time. > /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. Wow! I would have never ever had a look at smtp_dns_reply_filter. Thanks. >> 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. Thanks again. I will need to understand that first, but I will definitely give it a try. > Postfix has a "rule based language" for receiving mail, but there > is no such thing for outbound deliveries. Just out of curiosity: I do assume that implementing such a thing would be a major effort? Please, don't get me wrong, this isn't a feature request of mine. I am only curious of how much functionality would be needed for that? Thanks again and regards, Michael _______________________________________________ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
