I think I have found a bug in vpopmail. On freeBSD 4.6.2 if you telnet to 
localhost it actually uses ::1 as the IP:

iain@shiraz:~$ telnet localhost
Trying ::1...

If you have roaming smtp support enabled in vpopmail this can cause some 
problems. If you telnet to the IMAP port and login it causes the IP address 
::1 to be added to the table of relay hosts. tcprules can't process this 
entry so roaming smtp stops working.

cheers, Iain.

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