It does appear to be some sort of spam problem with comcast. It's weird, we've been playing with the same email with attachment and today, we finally got it to go through on one of the comcast accounts. Today,a couple of the emails (but not all) from yesterday appeared in a spam folder on the web based comcast mail program. The email also went through just fine on this person's outlook.
The question we have now is: is there a problem with Verizon's "new" web based email program. the old web program seems to work ok with some of the attachments. It doesn't make sense, but that's what we're looking at. I've tested this email with both user accounts...if we send the attachment using the new email program for recently signed up customers, it won't go through.....not even to the Comcast spam folder, the other person who has been using verizon mail for a few years has successfully sent the email attachment and has also received it.
Maybe there's been some sort of glitch this weekend we aren't aware of. Hopefully we'll continue to make progress.
I thank you so much for all of your help with this.