Using: 2003-04-09-win32-trunk
Steps:
- I tried to send a message;
- got a progress message box;
- the the operation took too long;
- I pressed Cancel button;
- after some time, the title of the progress message box change to contain "Not Responding"
- it's been about 15 minutes or so with no change of state;
Note: configuration of SMTP server didn't had nothing in its port field.