This does not appear to be an isolated issue. I use Time Warner Road Runner Email. I have no trouble receiving emails n two different accounts. Those same accounts CANNOT send any email. Receives a general error. I've tried recreating the accounts, and all the different options. The accounts work fine via standard email programs.
I spent half the day on Thursday trying to get my IMAP email account to send; and to get my hotmail account to work at all. The solution for me was to down load the K-9 EMail client. I had both of them working within 10 minutes. It is hard to believe that the out of the box android email client is so poor!