How can I stop my users sending mail to an external domain?

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Answer

You can use the redirect file to stop users sending mail to any specific external domain. To do this go to the Incoming > Redirect page and add the following rule to the redirect file.

MAIL Clause *
Remote IP Address 1.2.3.*
RCPT Clause external.com
Local IP Address *
Action Protocol Refuse with…
Parameter 500 Mail to external.com disallowed

In the above example the Remote IP Address is the same IP range that you have specified under Security > Local IP

The domain that you would like to stop your local users emailing is external.com

Keywords:Stop, Filter, Redirect, Send, sending, mail outgoing

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