On 8/11/2017 4:44 AM, Mai Ling wrote: > the primary mx is not refusing *me* the postifx box, it's refusing > connections initiated by me from one of the two IP address. > > Do the RFCs handle such cases? (fallback to a different > smtp_bind_address) > Does postfix have some round-robin or fallback choice of > smtp_bind_address? >
The RFCs and postfix allow retry from a different IP in the case of 4xx temporary failures. The RFCs and postfix do not allow retry after a 5xx permanent rejection. Attempting to workaround this will likely get your working IP and your sending domain blacklisted. Don't do it. -- Noel Jones
