Undeliverables from att.net/yahoo to Comcast

Questions:

• To a specific comcast.net (or is it comcast.com) email address?
• Only those email addresses?  Can you send email to yourself?
• Are you using the webmail or a email client app (Outlook, Thunderbird, etc.)?
• Where do you read "connection down"?  Is that part of a bounce message returned as an email to you?  If so what's the entire message since bounce messages have some error code info that might prove useful.

Two different comcast.net address in different towns last week and this morning.

I'm using the att mail interface - it that's what we're asking.

"connection" is my word. The error msg is:

Well, apparently I replied to my first msg. Sorry about that. gmail is working fine with comcast and it's MY IP address? Shouldn't all my mail to comcast be bouncing?

These are simple messages to addresses I've sent to for years, and recently.

Didn't even use texting jargon, as I don't text. These are little ol' ladies like me, we're arranging to go to he MN Arboretum. I've written hotter messages to my daughters on comcast. Only the link to the Arboretum which I've used/sent before for years!

As an experiment try sending a "dummy" message with something like "This is a test to see if I can send to you." to see if that gets through.  It's hard to believe comcast would block all email from att.net.  But then again, it is the competition.

On the other hand, I did a little searching and found this in the yahoo forums - no solution.  Seems the problem is not unique to you.

The test message never bounced, I've only had a few emails to Comcast address since, but they were received and answered. I didn't have to jump through any unblocking hoops with Comcast. If you intervened, thanks!!