Email Inconsistently sends; Tried all comcast recommended ports

Recently my comcast email stopped sending from Outlook 2013. I can email a single address, but not send a group email addresses. I have changed my pop account to imap and back (even deleted and added). I consulted a computer service who could not sort it out despite using the comcast recommended ports from the website and googling.What is going wron?. I have used the "repair" link, I always get the test message, and my message shows in sent box, but no error or rejected message comes up. Only that my group never received my message. I cc myself, I don't get it, it nevers comes to my Comcast inbox at the actual xfinity website. The messages are not in my outboxBoth of my computers accessing and sending via my comcast.net address are doing this. What is the problem?995 incoming Port, 587 TLS Outgoing Port currently; I prefer a pop account, to imap; Changed to imap and back with no difference.HELP!!

Sending uses the same SMTP server and port (465 SSL or 587 TLS) whether you use POP or IMAP. Don't rely on the "test" function; it's flaky. Compose and send a test message instead. Be aware that, if Comcast considers an email you send to be spam: If it's addressed to a Comcast recipient, they deliver it.If it's addresses to a non-Comcast recipient, they throw it away with no notice to you or the recipient. It's despicable, but that's what they do.Comcast Security Assurance manages this and should be able to help you figure out the problem. Call them at 1-888-565-4329 (from http://constantguard.comcast.net/dedicated-support/).
The first-line reps there are sometimes not very helpful. If so, be persistent, and keep at them until you get a satisfactory answer.

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