I'm having a problem receiving email. Internal email is fine but it takes it about 2 hours for an external email to actually get into a users inbox. First I thought it was my spam filter so I turned the spam filter off but I still have the same results. I'm running Zimbra FOSS 6.0.6_GA_2324 on Ubuntu 8.04 and it has been running without any problems for over 2 years now. I didn't make any network changes and network speed is up to par. Does anyone have any ideas?