It was working yesterday and I can't think of anything that has changed. I'm using Tiger mail with a few POP email providers. Whenever I go to send mail it has trouble with the smtp server thing (sorry). It gets incoming mail just fine off the POP provider. It's the outgoing it has trouble with. I tried turning off firewall. Nothing. Tried a different POP service thinking it might be the provider, and it said the same thing with that smtp as well (see attached pic). So it's not the email provider. Incoming is fine. And yes I spelled the "smtp.comcast.net" correctly in the outgoing box under Mail prefs. What else?