I, and my users, have several email addresses in our domain that are unable to send to Comcast.  Now, my first assumption was that the server IP got blacklisted.  I checked that, and it doesn't appear to be.  And when the emails go out, I'm not getting any kind of bounce back from Comcast.  They just disappear into the void.  Now, without a bounceback, I can't give LP the info that they are looking for.

Has anyone else run into a similar dilemma?  I know, based on the searching that I have done, that Comcast is a royal pain in this regard.  I was just hoping to find someone out there with a "been there, done that".

T J