Mail.app is doing on a specific port, launch it from a terminal like so:/Applications/Mail.app/Contents/MacOS/Mail -LogActivityOnPort 25Mail.app will start as usual, but all activities regarding port 25 (smtp) will be logged into the terminal window. Another port of interest would be 110 (pop).I found this in one of my one-liner-docs. As I wrote in the "Unix/Linux Survival Guide" (link on the right), always keep a text file with one-liners you stumble over handy. I forgot to take note where I found this hint, though. Whoever wrote about this somewhere in the Internet, thanks a million.
