Email not working

My email quit working so if you haven't heard from me, that's probably why. I don't get an error message and I'm still receiving emails... but on Friday night I discovered that emails I send are never arriving. I'm not sure how long this has been going on.
Anyway if I left you hanging in an email conversation... I probably replied and you just never got it. I hope to be back to normal soon, but am losing hope as the days progress.