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?
rlapczukAsked:
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stuartwardConnect With a Mentor Commented:
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.
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CaballeroFCommented:
hi,
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.

Fernando


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