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
DESCRIPTIONThe 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 inet:host:port:name, or UNIX-domain endpoints of the form unix:pathname:name. In both cases, name specifies the name field in a socketmap client request (see "REQUEST FORMAT" below).
PROTOCOLSocketmaps 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.
REQUEST FORMATThe socketmap protocol supports only the lookup request. The request has the following form:
- 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.
REPLY FORMATThe Postfix socketmap client requires that replies are not longer than 100000 characters (not including the netstring encapsulation). Replies must have the following form:
- 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 descriptive text.
This map cannot be used for security-sensitive information, because neither the connection nor the server are authenticated.
README FILESUse "postconf readme_directory" or "postconf html_directory" to locate this information.
DATABASE_README, Postfix lookup table overview
BUGSThe protocol limits are not yet configurable.
LICENSEThe Secure Mailer license must be distributed with this software.
HISTORYSocketmap support was introduced with Postfix version 2.10.
Wietse Venema IBM T.J. Watson Research P.O. Box 704 Yorktown Heights, NY 10598, USA Wietse Venema Google, Inc. 111 8th Avenue New York, NY 10011, USA