* Rem P Roberti <remegius@xxxxxxxxxxx> [2009-02-16 10:00:10 -0800]:
I have comcast as my ISP, and while according to comcast I should beable to usesmtp.comcast.net:25 as my smtp host, whenever I try to send email, I get an error saying that it is an invalid smtp host.Comcast is my provider, but port 25 does not work here. I have to use port 587. I am using Mutt in conjunction with msmtp.
Same here.
Sometime last year Comcast claimed that my machine was the source of some spamming (it was not) and they blocked any mail I tried to send. They required me to switch to a different port in order to re-enable outgoing email. Apparently port 25 is a frequent target for hack attacks, so Comcast is shutting it down as a security measure.