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I am using sendmail in RHEL 5. I have three mail accounts for the users jack, bob and alice. I want to make sure that user bob can send mail to alice but jack can't send mail to alice. But user jack can send mail to bob. How can i do this?

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Do you just want to block Jack → Alice, or do you want to block Jack → Everyone but Bob? And do you want to block jack@externalsystem.example.com from sending to Alice too? – mattdm Jan 2 '11 at 12:51
Hi Mattdm, I want to restrict user jack to send mail to alice. But everyone can send mail to user alice except user jack... – user2914 Jan 3 '11 at 3:29

A simple approach would be to set up a .procmailrc file in Alice's home directory to throw away mail from Jack (see "man procmail").

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Try to look at this link http://www.linuxquestions.org/questions/slackware-14/sendmail-block-email-to-particular-user-on-same-domain-676596/

That might work for you too.

Ismael Casimpan :)

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