Virtual Domains

Virtual domains functionality in Postfix provides a means to redirect messages to different locations by altering the message envelope address. The header address is not altered by a virtual domain mapping. While some functionality of virtual domains overlaps with features available in aliases, virtual domains can be used for local or non-local addresses, while aliases can only be used for local address.

Domain mapping lookup tables

Much like aliases tables and canonical mapping tables discussed in the previous sections, this is simply the path to a file containing the mapping tables for virtual domains. This is usually something along the lines of hash:/etc/postfix/virtual, and must be converted to a database format for use in Postfix. Webmin will perform the database generation step for you.