I am reconfiguring a network. We are using MS Exchange 2003 on a 2000 server. I have POP3 and SMTP services running but when remote users who connect via POP3 try to send any email to an outside email address they get:553 Requested action not taken: mailbox name not allowed or chunk too large
They can send mail to internal users i.e. other users in the global address list.
It's a few different users so I ruled out the Apostrophes issue mentioned in:
POP3 is enable for incoming and outgoing. SMTP is enabled for incoming and outgoing. Both are NATed to the Exchange box.
Anybody else run into this and have any sort of solution?