= Postfix Rewriting =

Postfix supports '''rewriting addresses''' in a few different ways.

<<TableOfContents>>

----



== Generic ==

To rewrite addresses as mail is sent, try:

{{{
smtp_generic_maps = lmdb:/etc/postfix/generic
}}}

A `generic(5)` file looks like:

{{{
root@localdomain alias@gmail.com
root             alias@gmail.com
@localdomain     alias@gmail.com
}}}

The first part of each line is a pattern. The second part is the address that overwrites a matching address.

Note the second line only rewrites addresses using a domain in `$myorigin`, `$mydestination`, `$inet_interfaces`, or `$proxy_interfaces`. The matching also happens in that hierarchical order: by full address, then by local part, then by domain part.

Run `postmap /etc/postfix/generic` and a hashed file will be produced. If your `postmap(1)` does not use LMDB, replace the `lmdb:` with whatever algorithm ''was'' used.

----



== Canonical ==

To rewrite addresses as mail is received, try:

{{{
canonical_maps = lmdb:/etc/postfix/canonical
}}}

A `canonical(5)` file is structured and hashed in the same way as a `generic(5)` file.

----



== Recipient Canonical ==

If ''only'' recipient address should be rewritten, but otherwise all of the same behaviors of a `canonical(5)` file is desired, try:

{{{
recipient_canonical_maps = lmdb:/etc/postfix/recipient_canonical
}}}

----



== See also ==

[[https://man.archlinux.org/man/generic.5|generic(5)]]

[[https://man.archlinux.org/man/canonical.5|canonical(5)]]



----
CategoryRicottone