Can't send email since last update.
Since 10.8.3 update I can seldom send email from my main email address. Once in a while it will go but I usually have to choose a different server than my preferred one where I get all my email. I have tried changing tons of things and continue to have the problem. No problem with getting mail.
Margaret
iMac Intel
iMac, Mac OS X (10.5.8)