8:32 AM

Argh. Apple Mail phones home too.

ach time I reply to a message, Mail attempts to contact an Apple server through port 80. That’s not a problem at home, but it is at work, where the proxy redirects all HTTP traffic through another port. Mail didn’t respect my proxy settings. It carried on regardless with a process that eventually failed after lengthy delay.

…

One we understood the problem, we could google for an answer. It turns out that Jonathan Wight experienced the same thing “a year ago”http://toxicsoftware.com/blog/mailapp_hangs_problem_and_solution/. He also provides a fix: delete the ~/Library/Preferences/com.apple.security.plist preferences file.