02-23-2010
Every one is using reply code 252 when a definitive certainty is not exist.
Postfix SMTP server provide definitive certainty when an address is not exist.
Quite amazing that most of the people says this as a complaint but you want this as a solution. don't mistake me
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LEARN ABOUT X11R4
nisplus_table
NISPLUS_TABLE(5) File Formats Manual NISPLUS_TABLE(5)
NAME
nisplus_table - Postfix NIS+ client
SYNOPSIS
postmap -q "string" "nisplus:[name=%s];name.name."
postmap -q - "nisplus:[name=%s];name.name." <inputfile
DESCRIPTION
The Postfix mail system uses optional lookup tables. These tables are usually in dbm or db format. Alternatively, lookup tables can be
specified as NIS+ databases.
To find out what types of lookup tables your Postfix system supports use the "postconf -m" command.
To test Postfix NIS+ lookup tables, use the "postmap -q" command as described in the SYNOPSIS above.
QUERY SYNTAX
Most of the NIS+ query is specified via the NIS+ map name. The general format of a Postfix NIS+ map name is as follows:
nisplus:[name=%s];name.name.name.:column
Postfix NIS+ map names differ from what one normally would use with commands such as niscat:
o With each NIS+ table lookup, "%s" is replaced by a version of the lookup string. There can be only one "%s" instance in a Postfix
NIS+ map name.
o Postfix NIS+ map names use ";" instead of ",", because the latter character is special in the Postfix main.cf file. Postfix
replaces ";" characters in the map name by "," before making NIS+ queries.
o The ":column" part in the NIS+ map name is not part of the actual NIS+ query. Instead, it specifies the number of the table column
that provides the lookup result. When no ":column" is specified the first column (1) is used.
EXAMPLE
A NIS+ aliases map might be queried as follows:
alias_maps = dbm:/etc/mail/aliases,
nisplus:[alias=%s];mail_aliases.org_dir.$mydomain.:1
This queries the local aliases file before the NIS+ file.
SEE ALSO
postmap(1), Postfix lookup table manager
README FILES
Use "postconf readme_directory" or "postconf html_directory" to locate this information.
DATABASE_README, Postfix lookup table overview
LICENSE
The Secure Mailer license must be distributed with this software.
AUTHOR(S)
Geoff Gibbs
UK-HGMP-RC
Hinxton
Cambridge
CB10 1SB, UK
Adopted and adapted by:
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
NISPLUS_TABLE(5)