Red Hat Sendmail FAQ
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4.5 I had a user leave recently and we forwarded his mail once he let us know where to send it, but he has 30 messages in his old mail spool which won't forward. How can we send him this mail at his new address?

This should work just fine: formail -Y -s /usr/sbin/sendmail user@new.address < /var/spool/mail/user.

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4.4 We had a user leave and are forwarding his mail, but we're still getting lots of mail for him. What can we do to let people know he's moved on?Up4.6 I run a mass e-mail to some 40,000 customers every month. My file system gets hammered about 4 times during the mailing at about 10k each. I believe the problem is that mail got so stacked up in the queue, the kernel can't deal with it any longer.