EMAIL problems!

First I am having terrible problems with my comcast email! I can receive emails and I can answer them.....BUT everything I send out appears to be sent however they are going into a black hole because no one is getting them. It's quite frustrating. I've reported it several times this week to Comcast.....today I finally think I got someone there's attention so I am hoping it's fixed soon. In the meantime I am trying to re-answer emails using my gmail "junk" account....if you haven't heard from me please bear with me and re-send your email. Thanks,