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(qmail) How to block outgoing mail to outside

(qmail) How to block outgoing mail to outside


We run a Gentoo linux server with qmail hosting a few domain.

One domain, just called it is for internal communication only. We don't want our group members to send email to outside world and don't want them to receive outside mail either.

We do use SSL for both POP3 and SMTP.

To block outside mail from reaching, we configure the file /var/qmail/control/goodmailfrom.

But we stump on how to block our members from sending mail to outside like gmail, yahoo.

We would appreciate any hints, tips, pointers on this issue.

Nathan Tran

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