Mail.app does not like ssl on non-standard port

Simple set up with imaps via ssh tunnel on another machine.
I am connecting via a tunnel and expect to have certificate errors on connection.
Connecting from mail.app with the server on port 10933 does not work. Thunderbird works with the same configuration.
Changing only the port number on the tunnel machine (to 993) then Mail.app performs as expected. No difference to Thunderbird.

Sorry, this is not a solution, but I had the same problem and did extensive troubleshooting on it today. It seems that if the port# is non-standard, Mail will connect in the clear, regardless whether the SSL box is checked.
I was trying to run an SSL-enabled IMAP server (dovecot) on port 1009. I verified that Mail was connecting to that port using netstat. However, it did not succeed in connecting, it reported a timeout error. Yet I can connect manually with openssl s_client.
Next I tried running the non-SSL IMAP server on the same port, WITHOUT changing any of the Mail settings: still port 1009, SSL box checked. This time it did connect properly.
Must be a bug in Mail.app
PowerBook G4 Mac OS X (10.4.3)

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