I'm not sure if this is related directly to Thunderbird or if there is something going on with my SMTP outgoing mail servers. When I send certain pieces of email, it takes upwards of 30 seconds before Thunderbird actually sends the email. The program hangs at "delivering mail." Some messages when replied to send right away with no hang time whatsoever. Most, however, take a long while before I receive verification the message was sent. I contacted Adelphia about the SMTP servers but of course they say there is no problem. I use ZoneAlarm Pro but have the virus check set to off for outgoing messages. I see no other settings anywhere for outgoing email. Does anyone have an idea why i'm getting this long delay before Thunderbird verifies the email message has been sent?