Yesterday SMTP stopped functioning correctly on my server. Pop3 works fine but when sending emails from outlook it will tell me it can't connect or i need to check my authentication. This is occuring across multiple domain names and isn't restricted to one account. Occasionally one email will get through, but then after that nothing. I didn't do anything to the server that may have caused this. The only thing I think of is the automatic Cpanel update (I'm on the STABLE build). I've tried restarting exim and cpop3, and even restarting the entire server. I've done a forced upgrade of exim and it hasn't helped. I've even recreated the email accounts and it still hasn't helped.
Any ideas on what's causing this, or at the very least things I should look into that might give me an idea of what's wrong.
