Edit /etc/postfix/main.cf file and add the following parameters.
1. virtual_mailbox_domains=/etc/postfix/vdomains
Here, /etc/postfix/vdomains is the file which contains names of the domains to be setup virtually and handled by postfix. Remember to enter one domain per line.
2. virtual_mailbox_base=/home/vmail
It tells the postfix system about the base directory of the mail store. It can be any directory on the unix system.
3. virtual_mailbox_maps=hash:/etc/postfix/vmaps
Here I have created a lookup file that maps email addresses to their mailboxes. A virtual mailbox will looks like the following.
test@test.com test.com/test
webmaster@mydomain.com mydomain.com/webmaster
Remember to create the hash table of the file using the following command:
#postmap /etc/postfix/vmaps
4. Setup mailbox file ownership using following directives in main.cf.
virtual_uid_maps=
virtual_gid_maps=
5. Create required folders under /home/vmail, e.g. for domain mydomain.com and user webmaster, the directory structure will looks like the following:
#mkdir /home/vmail/mydomain.com
#mkdir /home/vmail/mydomain.com/webmaster
#mkdir -p /home/vmail/mydomain.com/webmaster/{cur,new}
6. Change ownership and folder permissions.
#chown -R postfix.postfix /home/vmail/mydomain.com
#chmod -R 775 /home/vmail/mydomain.com
7. Reload postfix system to implement the changes done above.
#postfix reload
Thats it! Your postfix system has been configured to support multiple domains now.
Thanks!!!
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