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Apple Mail does not seem to connect to my IMAP server

I have my own Mailhosting, and am moving servers. Thunderbird works fine with the new Server IP. However, Apple Mail seems to fail and to silently ignore the new server. I am using Courier IMAP and ...
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Where are all these ipfw rules coming from?

Any attempt to connect to a server over port 143 is blocked by the OS. I've verified it's not my connection; other computers on the network can see the port just fine. I've replicated the problem on a ...