socketmap_table - Postfix socketmap table lookup client
postmap -q "string" socketmap:inet:host:port:name
postmap -q "string" socketmap:unix:pathname:name
postmap -q - socketmap:inet:host:port:name <inputfile
postmap -q - socketmap:unix:pathname:name <inputfile
The Postfix mail system uses optional tables for address rewriting. mail routing
or policy lookup.
The Postfix socketmap client expects TCP endpoint names of the form
, or UNIX-domain
endpoints of the form unix:pathname:name
. In both
specifies the name field in a socketmap client request (see
"REQUEST FORMAT" below).
Socketmaps use a simple protocol: the client sends one request, and the server
sends one reply. Each request and reply are sent as one netstring object.
The socketmap protocol supports only the lookup request. The request has the
- name <space> key
- Search the named socketmap for the specified key.
Postfix will not generate partial search keys such as domain names without one
or more subdomains, network addresses without one or more least-significant
octets, or email addresses without the localpart, address extension or domain
portion. This behavior is also found with cidr:, pcre:, and regexp: tables.
The Postfix socketmap client requires that replies are not longer than 100000
characters (not including the netstring encapsulation). Replies must have the
- OK <space> data
- The requested data was found.
- NOTFOUND <space>
- The requested data was not found.
- TEMP <space> reason
- TIMEOUT <space> reason
- PERM <space> reason
- The request failed. The reason, if non-empty, is
This map cannot be used for security-sensitive information,
because neither the connection nor the server are authenticated.
http://cr.yp.to/proto/netstrings.txt, netstring definition
postconf(1), Postfix supported lookup tables
postmap(1), Postfix lookup table manager
regexp_table(5), format of regular expression tables
pcre_table(5), format of PCRE tables
cidr_table(5), format of CIDR tables
Use " postconf readme_directory
" or " postconf
" to locate this information.
DATABASE_README, Postfix lookup table overview
The protocol limits are not yet configurable.
The Secure Mailer license must be distributed with this software.
Socketmap support was introduced with Postfix version 2.10.
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA
111 8th Avenue
New York, NY 10011, USA