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pop3 mail using exchange server

We currently have a group of users in Mexico that are using our Exchange Server for e-mail delivery and sending.  However since they converted from using our LAN as a access to the internet and started using their own ISP, they can only send mail within the domain, not outside.  Any thoughts as to what may be happening?
1 Solution
It sounds like a Relay setting on your Exchange server. Turn on the setting that lets authenticate clients relay under the

Exchange 2000
‘SMTP Virtual Server Properites’ --> ‘Access’ --> 'Relay'

Exchange 5.5
Under the IMS

I will need to set the clients to support ‘Outgoing mail authentication.’

This will stop spamers using your server, but let users sent mail.
If im not wrong, the proposed answer is used to restrict that external users send mails through your exchange, unles you explicity restrict inside domains, ip's or users to send e-mails.
Naturally, your inside users has the ability to do that.

Try working around at the DNS configuration and IMS connector delivery configuration inside exchange.


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