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<html> <head> </head> <body> <pre>
CANONICAL(5) CANONICAL(5)
<b>NAME</b>
canonical - format of Postfix canonical table
<b>SYNOPSIS</b>
<b>postmap</b> <b>/etc/postfix/canonical</b>
<b>DESCRIPTION</b>
The optional <b>canonical</b> file specifies an address mapping
for local and non-local addresses. The mapping is used by
the <a href="cleanup.8.html"><b>cleanup</b>(8)</a> daemon. The address mapping is recursive.
The file serves as input to the <a href="postmap.1.html"><b>postmap</b>(1)</a> command. The
result, an indexed file in <b>dbm</b> or <b>db</b> format, is used for
fast searching by the mail system. After an update it may
take a minute or so before the change becomes visible.
Issue a <b>postfix</b> <b>reload</b> command to eliminate the delay.
The <b>canonical</b> mapping affects both message header
addresses (i.e. addresses that appear inside messages) and
message envelope addresses (for example, the addresses
that are used in SMTP protocol commands). Think Sendmail
rule set <b>S3</b>, if you like.
Typically, one would use the <b>canonical</b> table to replace
login names by <i>Firstname.Lastname</i>, or to clean up
addresses produced by legacy mail systems.
The <b>canonical</b> mapping is not to be confused with <i>virtual</i>
<i>domain</i> support. Use the <a href="virtual.5.html"><b>virtual</b>(5)</a> map for that purpose.
The <b>canonical</b> mapping is not to be confused with local
aliasing. Use the <a href="aliases.5.html"><b>aliases</b>(5)</a> map for that purpose.
The format of the <b>canonical</b> table is as follows, mappings
being tried in the order as listed in this manual page:
blanks and comments
Blank lines are ignored, as are lines beginning
with `#'.
<i>user</i>@<i>domain</i> <i>address</i>
<i>user</i>@<i>domain</i> is replaced by <i>address</i>. This form has
the highest precedence.
This form useful to clean up addresses produced by
legacy mail systems. It can also be used to pro-
duce <i>Firstname.Lastname</i> style addresses, but see
below for a simpler solution.
<i>user</i> <i>address</i>
<i>user</i>@<i>site</i> is replaced by <i>address</i> when <i>site</i> is equal
to $<b>myorigin</b>, when <i>site</i> is listed in $<b>mydestina-</b>
<b>tion</b>, or when it is listed in $<b>inet</b><i>_</i><b>interfaces</b>.
1
CANONICAL(5) CANONICAL(5)
This form is useful for replacing login names by
<i>Firstname.Lastname</i>.
@<i>domain</i> <i>address</i>
Every address in <i>domain</i> is replaced by <i>address</i>.
This form has the lowest precedence.
In all the above forms, when <i>address</i> has the form @<i>other-</i>
<i>domain</i>, the result is the same user in <i>otherdomain</i>.
<b>ADDRESS</b> <b>EXTENSION</b>
When table lookup fails, and the address localpart con-
tains the optional recipient delimiter (e.g.,
<i>user+foo</i>@<i>domain</i>), the search is repeated for the unex-
tended address (e.g. <i>user</i>@<i>domain</i>), and the unmatched
extension is propagated to the result of table lookup. The
matching order is: <i>user+foo</i>@<i>domain</i>, <i>user</i>@<i>domain</i>, <i>user+foo</i>,
<i>user</i>, and @<i>domain</i>.
<b>BUGS</b>
The table format does not understand quoting conventions.
<b>CONFIGURATION</b> <b>PARAMETERS</b>
The following <b>main.cf</b> parameters are especially relevant
to this topic. See the Postfix <b>main.cf</b> file for syntax
details and for default values. Use the <b>postfix</b> <b>reload</b>
command after a configuration change.
<b>canonical</b><i>_</i><b>maps</b>
List of canonical mapping tables.
<b>recipient</b><i>_</i><b>canonical</b><i>_</i><b>maps</b>
Address mapping lookup table for envelope and
header recipient addresses.
<b>sender</b><i>_</i><b>canonical</b><i>_</i><b>maps</b>
Address mapping lookup table for envelope and
header sender addresses.
Other parameters of interest:
<b>inet</b><i>_</i><b>interfaces</b>
The network interface addresses that this system
receives mail on.
<b>masquerade</b><i>_</i><b>domains</b>
List of domains that hide their subdomain struc-
ture.
<b>masquerade</b><i>_</i><b>exceptions</b>
List of user names that are not subject to address
masquerading.
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CANONICAL(5) CANONICAL(5)
<b>mydestination</b>
List of domains that this mail system considers
local.
<b>myorigin</b>
The domain that is appended to locally-posted mail.
<b>owner</b><i>_</i><b>request</b><i>_</i><b>special</b>
Give special treatment to <b>owner-</b><i>xxx</i> and <i>xxx</i><b>-request</b>
addresses.
<b>SEE</b> <b>ALSO</b>
<a href="cleanup.8.html">cleanup(8)</a> canonicalize and enqueue mail
<a href="postmap.1.html">postmap(1)</a> create mapping table
<a href="virtual.5.html">virtual(5)</a> virtual domain mapping
<b>LICENSE</b>
The Secure Mailer license must be distributed with this
software.
<b>AUTHOR(S)</b>
Wietse Venema
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA
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