I was having helluva problems with my email a couple of weeks ago, it turns out my ISP, Comcast, was suddenly (and without notice) requiring me to use them as my smtp (bast**** they are also the only ones offering DSL in my area). Now my email headaches are gone ~:)
My problem is intermittent and sporadic. Although it's lasted for several days this time around and immediately after Support contacted me, I WAS able to send, but still not receive. Then, after I contacted them again, I WAS able then to send. Makes you wonder aye?
NOW, I CAN'T send again.....Oye!
Anyhow, as for what you've mentioned, I've got other accounts on my OE from different servers...all of which have had no problems at all.