Unable to receive external mail via POP3 connector

Hi I am using Exchange 2000.
I just started at this company and previuos techie had setup POP3 connectors for mailboxes.  Not sure why he had done that, but when I create new Exchange accounts in AD, they are able to send internal mail fine, and are able to send out to external, but just unable to receive from external.  No idea where to start, although here is a copy of my event viewer
POP3: Failed to check the POP3 account for user@domain.com at host.mail.domain.com on port 110. the error is 86
nutekconsultantsAsked:
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amaheshwariCommented:
Please check this , This is the same issue that you are talking about:

POP3 Connector Does Not Report Actual POP3 Server Errors
http://support.microsoft.com/kb/279985
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nutekconsultantsAuthor Commented:
and here is another error in the event viewer
POP3: An error occured during a POP3 transaction to host <mail.domain.com> [xxx.xxx.xxx.xxx]> For user <user@domain.com> The error is 86
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amaheshwariCommented:
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