CIDRTABLE(5) CIDRTABLE(5)

NAME
       cidrtable - format of Postfix CIDR tables

SYNOPSIS
       ppoossttmmaapp -qq ""string"" cciiddrr:://eettcc//ppoossttffiixx//filename

       ppoossttmmaapp -qq - cciiddrr:://eettcc//ppoossttffiixx//filename 
DESCRIPTION
       The  Postfix  mail  system  uses optional access control tables.  These
       tables are usually in ddbbmm or ddbb format.  Alternatively, access  control
       tables  can be specified in CIDR (Classless Inter-Domain Routing) form.

       To find out what types of lookup tables your  Postfix  system  supports
       use the ppoossttccoonnff -mm command.

       To test lookup tables, use the ppoossttmmaapp command as described in the SYN-
       OPSIS above.

TTAABBLLEE FFOORRMMAATT
       The general form of a Postfix CIDR table is:

       networkaddress//networkmask     result
              When a search string matches the specified  network  block,  use
              the corresponding result value. Specify 0.0.0.0/0 to match every
              address.

       networkaddress     result
              When a search string matches the specified network address,  use
              the corresponding result value.

       blank lines and comments
              Empty  lines and whitespace-only lines are ignored, as are lines
              whose first non-whitespace character is a `#'.

       multi-line text
              A logical line starts with  non-whitespace  text.  A  line  that
              starts with whitespace continues a logical line.

SSEEAARRCCHH OORRDDEERR
       Patterns  are  applied  in the order as specified in the table, until a
       pattern is found that matches the search string.

EEXXAAMMPPLLEE SSMMTTPPDD AACCCCEESSSS MMAAPP
       /etc/postfix/main.cf:
           smtpdclientrestrictions = ... cidr:/etc/postfix/client.cidr ...

       /etc/postfix/client.cidr:
           # Rule order matters. Put more specific whitelist entries
           # before more general blacklist entries.
           192.168.1.1             OK
           192.168.0.0/16          REJECT

SEE ALSO
       postmap(1), Postfix lookup table manager
       regexptable(5) format of regular expression tables
       pcretable(5) format of PCRE tables

README FILES       Use "ppoossttccoonnff rreeaaddmmeeddiirreeccttoorryy" or "ppoossttccoonnff hhttmmllddiirreeccttoorryy" to  locate
       this information.
       DATABASEREADME, Postfix lookup table overview

AUTHOR(S)       The CIDR table lookup code was originally written by:
       Jozsef Kadlecsik
       kadlec@blackhole.kfki.hu
       KFKI Research Institute for Particle and Nuclear Physics
       POB. 49
       1525 Budapest, Hungary

       Adopted and adapted by:
       Wietse Venema
       IBM T.J. Watson Research
       P.O. Box 704
       Yorktown Heights, NY 10598, USA



                                                                 CIDRTABLE(5)