said by koitsu:
To the OP: I've been down this road already. You won't get any answers from Comcast regarding technical details (timestamps, logs, or anything useful). Here's my story, with extensive technical details:
»[Spam] Comcast reporting spam from my IP
Thanks for sharing your experience with them. It is good to know that when I get such a letter from Comcast it does not necessarily mean that I was abusing sendmail, and it could have been a Comcast brain fart...
Since nothing in my network uses SMTP at all, I can't see how I would be sending spam. And since I do not use SMTP, I don't care if they block port 25.--