Re: retry 5xx using a fallback outgoing IP

I'm sorry but I fail to understand what value is your acid question bringing to the conversation.

FWIW, Mathus, the remote side is simply printing a 5xx one line message "not accepted" banner instead of the expected welcome 220 banner, not giving any explanation to why, then closing the tcp session, without postfix even getting a chance to say HELO!

However, the topic of this thread is: Can postfix retry a failed message, by attempting to retransmit using a different outgoing IP address of the machine it's running on?

If I send a mail to the same destination using the old IP address, a regular smtp conversation takes place and email is accepted by the remote side!

Thank you


Re: retry 5xx using a fallback outgoing IP

By Noel Jones at 08/10/2017 - 16:45

On 8/10/2017 12:29 PM, Mai Ling wrote:

If you're willing to use the old IP for failed mail, why not just
use the old IP for ALL mail until until your new IP gets set up for
proper FCrDNS and (maybe) removed from blacklists?

-- Noel Jones

Re: retry 5xx using a fallback outgoing IP

By Wietse Venema at 08/10/2017 - 14:06

Mai Ling:
If the primary MX for a domain does not want to talk to you,
why are you ignoring the content of their response?