Mail.app Slow to Send Messages

Sending mail takes forever. After I click send, it can take up to a minute for the send sound to be triggered and the message be sent to the mail server.
I run my own mail server, so I can see that exactly as the sound is played the message is received by the SMTP server.
What on earth is Mail.app doing for that 30-60 seconds after I click send? In Thunderbird there is at most a 4 second delay.

The open-apple-0 Activity Viewer in Mail.app just says:
Delivering Message
Connecting to server "SMTP.server.name"
This SMTP server is on a private 1000Mbps LAN. The mail client I use in Linux (also on a separate machine from the server) is able to establish an SMTP connection and send the message almost instantaneously. The fastest OS X can do it is 10-60 seconds.
The same sort of slow connection affect is visible using the "Connect to Server..." feature of the Finder. Perhaps the underlying problem is not with Mail.app but the socket creator in OS X?
Chris

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