CentOS 7.x postfix email virtualhosting

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It is possible to setup postfix server for multiple domains (eg sbarjatiya.com, pbarjatiya.com, etc.) on a single server. To perform postfix email virtualhosting use following steps:

1. Edit /etc/postfix/main.cf as follows
   1. Set myhostname = localhost
   2. Add following lines at bottom

      virtual_mailbox_domains = /etc/postfix/vhosts.txt
      virtual_alias_maps = hash:/etc/postfix/valias.txt

2. Create /etc/postfix/vhosts.txt and write one domain name on each line. For example

   sbarjatiya.com
   pbarjatiya.com

3. Create /etc/postfix/valias.txt. Write incoming and forwarding address one on each line. For domain forwarding mention incoming address as @domain.

   saurabh@sbarjatiya.com     barjatiya.saurabh@gmail.com
   spam@sbarjatiya.com        saurabhisgood@yahoo.com
   @sbarjatiya.com            check-when-free@gmail.com
   parag@pbarjatiya.com       parag@gmail.com
   priyanka@pbarjatiya.com    priyanka@gmail.com
   @pbarjatiya.com            check-when-free@gmail.com

4. Create map using

   cd /etc/postfix
   postmap valias.txt

5. Reload postfix using

   systemctl reload postfix

6. Test by sending various emails to different domains. You can check queue on server using "postqueue -p" in case email is not delivered. Also check /var/log/maillog for troubleshooting.

Refer;

• https://www.howtoforge.com/linux_postfix_virtual_hosting

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