On Dec 7, 2006, at 12:51 PM, Efren Bravo wrote:
Which feature of Sendmail can I use to prohibit
an local user to send and to receive mails?

For intance:

jhon receive from *.cu only
     send    to *.cu and *.domain.com

While it is possible to prevent a user from sending mail at all, it is not easily possible to permit them to send mail, but only to a limited set of domains, using the normal mechanisms. While you can write your own LOCAL_RULESETS to accomplish the goal, anyone with a smidgen of clue could work around such a restriction by forging email as if it came from another user.

In other words, you're describing a social problem which should be enforced by getting the user to agree to use email only for legitimate purposes, and by monitoring their usage by checking the mail logfiles to ensure they don't abuse email by sending to inappropriate domains.


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