What version of Symantec are you running? Did you upgrade recently? I am on
Symantec Antivirus Corp 10.1.6.6010 and had determained with symantec that
the Symantec Email tool (POP3/SMTP Sanp-in) was the issue. I removed that
tool for testing and issue went away. Looks like they messed up on one of
there updates that somehow hosed that feature. They are now looking into the
issue and will release a Point patch for this issue if they fix it. We were
on 10.1.6.6000. Lately Symantec has released updates that then cause other
issue. Symantec is starting to be compared to Mcaffee!