NISPLUS\_TABLE(5) File Formats Manual NISPLUS\_TABLE(5)

# [NAME](#NAME)

nisplus\_table - Postfix NIS+ client

# [SYNOPSIS](#SYNOPSIS)

```
postmap -q "string" "nisplus:[name=%s];name.name."
postmap -q - "nisplus:[name=%s];name.name." <inputfile
```

# [DESCRIPTION](#DESCRIPTION)

The Postfix mail system uses optional lookup tables. rewriting or mail routing. These tables are usually in **lmdb:**, **cdb:**, **hash:**, or **dbm:** 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](#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**:

- 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.
- 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.
- 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)](/man/os/postfix/column.1) is used.

# [EXAMPLE](#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](#SEE_ALSO)

```
postmap(1), Postfix lookup table manager
```

# [README FILES](#README_FILES)

```

```

Use "**postconf readme\_directory**" or "**postconf html\_directory**" to locate this information.

```
DATABASE_README, Postfix lookup table overview
```

# [LICENSE](#LICENSE)

```

```

The Secure Mailer license must be distributed with this software.

# [AUTHOR(S)](#AUTHOR%28S%29)

```
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
```

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Document: nisplus_table(5) from postfix 3.11.7-r3 (Chainguard OS)
Source: https://github.com/vdukhovni/postfix