Postfix Lookup Tables
September 14, 2008 Postfix Configuration
Lookup Tables are simple tables that allow Postfix to access configuration information that it needs. An example is when an organization would like to rewrite the email addresses so that they look different to outside clients. The parameter canonical_maps is the file that is used to make these changes and is used as a Lookup Table. In the example the organization wants to change the tsmith@example.org to tom.smith@example.org outside of the network. The file Lookup Table must be created like the example below:
# canonical mappings # tsmith@example.org tom.smith@example.org
It should be saved as /etc/postfix/canonical
Once you have saved the file you must run the postmap command:
postmap /etc/postfix/canonical
Now you can run a query on the mappings that you have set.
postmap -q tsmith@example.org /etc/postfix/canonical tom.smith@example.org
