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If you’re migrating a domain, sometimes their mail will go to the old server for a while after you’ve changed the DNS. You can move their mail to the new server by following these steps:

1) Go to the user’s Maildir directory
cd /var/qmail/mailnames/<domain>/<user>/Maildir

2) Tar their mail directories
tar cvzf <user>.tar.gz cur new tmp

3) Move to a web accessible location
mv <user>.tar.gz /home/httpd/vhosts/<web-accessible-domain>/httpdocs/

4) Log onto the second server and go to the user’s Maildir directory
cd /var/qmail/mailnames/<domain>/<user>/Maildir

5) Retrieve the user’s mail tar file that you created
wget http://<web-accessible-domain>/<user>.tar.gz

6) Un-tar the files to their correct locations
tar xvzf <user>.tar.gz

7) Remove the tar file
rm <user>.tar.gz

8) Go to the original server and remove the tar file
rm /home/httpd/vhosts/<web-accessible-domain>/httpdocs/<user>.tar.gz

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