I have a mail server for a domain foo.com. Currently all users mail box is also in the same server. Now this company is starting its operation in multiple Countries. How can I have mailbox store of the users in one country to be stored locally in a server in that country office server. My current setup is a combination of Postfix + Courier IMAP + MySQL + Amavisd-new + SpamAssassin + ClamAV + SASL . Basically what I need is user A's mails should go to the server in Country A and user B's mails should go to the server in Country B. If my question is not clear enough I am open to questions. One main thing here is the domain name should be the same for all users.
SnapOverflow
Use transport maps. Transport maps gives you the flexibility to direct individual users/domains to different email servers.