Even though this may not be the reason why Apple Mail isn’t working for you, it’s worth trying. Heavy emails can put a strain on your system, which in turn can cause Apple Mail not to work ...

Mail.app unable to connect to servers -- solution Several users have reported an issue where Mail.app is unable to connect to POP and IMAP mail servers after applying the Mac OS X 10.4.7 update.

my wife would like to check her email on a pc but when she tries to send emails she gets a lot of errors and no results. receiving mail is fine, it does that just great, but sending just doesn't ...