Very strange…any suggestions?

Here’s the strange part:
No IP or mail program on the customer’s computer (ping, traceroute, Netscape Messenger,
Eudora or Outlook) will even send an initial packet (no network activity
indication on ZoneAlarm) if the destination is one particular POP & SMTP server name…any other server name works OK.

Got it to work by using POP & SMTP mail servers’ IP address, rather than server name.

I suspect there’s a system file that’s corrupt. Any suggestions?