Postfix retry rejected emails
Our company uses pfSense Postfix package as an MSExchange gateway.
Every so often we get a 550 rejected error. I can't remember the last time we were on a blacklist, but it still seems to happen with a couple domains regardless. I've tried sending variations of the emails (removing signatures, images, links etc etc) but still rejected.
Typically, I will just manually switch over the mail server outbound NAT to a different static IP address as a temporary fix but am wondering if it would be possible to do something like this automatically?