Comcast are blocking your incoming port 25 so that you can't run your own SMTP server. When you send e-mail you send it to someone else's server on port 25. Regards, Rob. On 6 Oct 2008, at 14:46, wilkinw wrote: > 2.66, Intel Duo Core Xeon 8 gig memory, 4 - 1 terabyte drives, X.5.5. > > I really feel embarrassed about this and should know this. Got an > email from Comcast stating that they have blocked port 25 for spam. > I don't spam, the only other users of my computer is my wife who > only uses yahoo email. So I know that Mac Mail uses port 25. How > would this happen? Also even though Comcast states that they have > blocked port 25 it still seems like me emails are going out. I sent > a test email to my daughter and my work email and they went thru. > Any help would be appreciated. I tried to check if you can change > the ports in mail but don't see any options, Wayne.