2.	vi main.cf
3.	Add this line at end:

virtual_alias_maps=hash:/usr/syno/mailstation/etc/virtual

4.	Select virtual:
You can list any mail address to any username!

domain1.com anything
pim@domain1.com pimdomain1
pim@domain2.com pimdomain2

5.	Next you need to compile this file into virtual.db. Login with the PuTTYtel as: User=root, Password=your admin password.
6.	Write this: /usr/syno/mailstation/sbin/postmap /usr/syno/mailstation/etc/virtual
7.	Check it: cd /usr/syno/mailstation/etc
8.	Write: dir
9.	Now a virtual.db should be available on the server.
10.	Now you need to restart the postfix program:

/usr/syno/mailstation/sbin/postfix stop
/usr/syno/mailstation/sbin/postfix start

11.	Now you are done however please allow up to 1 minute before postfix is updated.