For those of you getting sick of Apple Mail pestering you about your beautiful self-signed SSL certificates running on your home-brew Gentoo 386SX/16 imaps/pop3s server, check out Apple’s knowledge base article 25593 to fix the problem once and for all.

After that:

• double-click on your newly-imported certificate in the Keychain Access utility,
• scroll down to the bottom of the window and click on the “Trust Settings” disclosure triangle,
• and finally, set the “When using this certificate” selector to “Always Trust”.

Huzzah, no more SSL shenanigans.