I always wondered why there isn’t a config option in MTAs that tries to route an email over different other MTA‘s submission port and tries until delivered. I m

I always wondered why there isn’t a config option in MTAs that tries to route an email over different other MTA‘s submission port and tries until delivered. I mean a automated setup not static rules you mention. This would make self hosted setups so much easier. The chance that someone blocked your cloud server‘s IP address 4 years ago and never bothered removing it is high.