When I add an email account, I can use it to send and recieve email just fine. A few days later, I can receive email, but not send. Nothing has changed in the settings and I've not changed any "habits" or places where I'm at when I try to send email. If I delete the account and re-add it using exactly the same settings, I can then send again from that account. A few days later, tho.... I can't send.
Any ideas? This is very annoying.