I doubt it's your firewall since mail is being sent out.
There was a problem with multiple Comcast servers being down Friday, but that issue was resolved.
I don't think there is a link between the outage and your issue.
The filters only apply to incoming mail, not outgoing.
At this point I want to direct you to the Comcast help forums
. Those forums are provided to Comcast customers, and are a great resource for vendor specific issues. There are forums for computer issues, email issues, security, internet, cable tv, and CDV.
Many times we, the users there, can provide answers tech support and customer service can't.
Click the link below, you'll be sent to the sign in page. Log in with your Comcast user ID (the part before .net) and your password. You will next see a first time forum users page, asking you to choose a screen name for use in the forums. Once you set that up, you'll be taken to the actual forums. http://forums.comcast.net/comcastsupport/
Post your issue in the Email forum. Include as many details as possible. Are you using SmartZone or an email client for mail access? Are you receiving any error or bounce messages? Is so, post the entire error or bounce message. Substitute
xxx for any part of addresses before the @whatever.
How did you find out the messages are not going through?
Have they gone through to these addresses in the past? Whatever you can think of, include it.
The email experts will do their best to help you solve this issue.
(Once you get to the forum, save the page to your favorites. If you want to get to it from the Comcast home page, you have to jump through hoops to reach it)
Edited by Queen-Evie, 28 March 2010 - 02:20 PM.