I am currently working on a setup using nginx mail module with several backends. Due to port exhaustion, I would like to do splitting of outgoing connections across several IPs. For http this is well documented, but for the mail module I could not find anything. Simply trying "proxy_bind" in the mail{}-config does not yield any success, because it is forbidden in this context.

How would you tackle port exhaustion with many long-running IMAP connections?

Best regards
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