This should work just fine: formail -Y -s /usr/sbin/sendmail email@example.com < /var/spool/mail/user.
|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?||Up||4.6 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.|