.TH MONGODB_TABLE 5 
.ad
.fi
.SH NAME
mongodb_table
\-
Postfix MongoDB client configuration
.SH "SYNOPSIS"
.na
.nf
\fBpostmap \-q "\fIstring\fB" mongodb:/etc/postfix/\fIfilename\fR

\fBpostmap \-q \- mongodb:/etc/postfix/\fIfilename\fB <\fIinputfile\fR
.SH DESCRIPTION
.ad
.fi
The Postfix mail system uses optional tables for address
rewriting or mail routing. These tables are usually in
\fBlmdb:\fR, \fBcdb:\fR, \fBhash:\fR, or \fBdbm:\fR format.

Alternatively, lookup tables can be specified as MongoDB
databases.
To find out what types of lookup tables your Postfix system
supports use the "\fBpostconf \-m\fR" command.

In order to use MongoDB lookups, define a MongoDB
source as a lookup table in main.cf, for example:
.nf
    alias_maps = mongodb:/etc/postfix/mongodb\-aliases.cf
.fi

In this example, the file /etc/postfix/mongodb\-aliases.cf
has the same format as the Postfix main.cf file, and can
specify the parameters described below. It is also possible
to have the configuration in main.cf; see "OBSOLETE MAIN.CF
PARAMETERS" below.

It is strongly recommended to use proxy:mongodb, in order
to reduce the number of database connections. For example:
.nf
    alias_maps = proxy:mongodb:/etc/postfix/mongodb\-aliases.cf
.fi

Note: when using proxy:mongodb:/\fIfile\fR, the file must
be readable by the unprivileged postfix user (specified
with the Postfix mail_owner configuration parameter).
.SH "MONGODB PARAMETERS"
.na
.nf
.ad
.fi
.IP "\fBuri\fR"
The URI of mongo server/cluster that Postfix will try to
connect to and query from. Please see
.nf
https://www.mongodb.com/docs/manual/reference/connection\-string/
.fi

Example:
.nf
    uri = mongodb+srv://user:pass@loclhost:27017/mail
.fi
.IP "\fBdbname\fR"
Name of the database to read the information from.
Example:
.nf
    dbname = mail
.fi
.IP "\fBcollection\fR"
Name of the collection (table) to read the information from.
Example:
.nf
    collection = mailbox
.fi
.IP "\fBquery_filter\fR"
The MongoDB query template used to search the database,
where \fB%s\fR is a substitute for the email address that
Postfix is trying to resolve. Please see:
.nf
https://www.mongodb.com/docs/manual/tutorial/query\-documents/
.fi

Example:
.nf
    query_filter = {"$or": [{"username": "%s"}, {"alias.address": "%s"}], "active": 1}
.fi

This parameter supports the following '%' expansions:
.RS
.IP "\fB%%\fR"
This is replaced by a literal '%' character.
.IP "\fB%s\fR"
This is replaced by the input key. The %s must appear in
quotes, because all Postfix queries are strings containing
(parts from) a domain or email address. Postfix makes no
numerical queries.
.IP "\fB%u\fR"
When the input key is an address of the form user@domain,
\fB%u\fR is replaced by the local part of the address.
Otherwise, \fB%u\fR is replaced by the entire search string.
.IP "\fB%d\fR"
When the input key is an address of the form user@domain,
\fB%d\fR is replaced by the domain part of the address.
.IP "\fB%[1\-9]\fR"
The patterns %1, %2, ... %9 are replaced by the corresponding
most significant component of the input key's domain. If
the input key is \fIuser@mail.example.com\fR, then %1 is
\fBcom\fR, %2 is \fBexample\fR and %3 is \fBmail\fR.
.RE
.IP
In the above substitutions, characters will be quoted as
required by RFC 4627. For example, each double quote or
backslash character will be escaped with a backslash
characacter.
.IP "\fBprojection\fR"
Advanced MongoDB query projections. Please see:
.nf
https://www.mongodb.com/docs/manual/tutorial/project\-fields\-from\-query\-results/
.fi

.RS
.IP \(bu
If \fBprojection\fR is non\-empty, then \fBresult_attribute\fR
must be empty.
.IP \(bu
This implementation can extract information only from result
fields that have type \fBstring\fR (UTF8), \fBinteger\fR
(int32, int64) and \fBarray\fR. Other result fields will
be ignored with a warning. Please see:
.nf
https://mongoc.org/libbson/current/bson_type_t.html
.fi
.IP \(bu
As with \fBresult_attribute\fR, the top\-level _id field
(type OID) is automatically removed from projection results.
.RE
.IP "\fBresult_attribute\fR"
Comma or whitespace separated list with the names of fields
to be returned in a lookup result.

.RS
.IP \(bu
If \fBresult_attribute\fR is non\-empty, then \fBprojection\fR
must be empty.
.IP \(bu
As with \fBprojection\fR, the top\-level _id field (type
OID) is automatically removed from lookup results.
.RE
.IP "\fBresult_format (default: \fB%s\fR)\fR"
Format template applied to the result from \fBprojection\fR
or \fBresult_attribute\fR. Most commonly used to append (or
prepend) text to the result. This parameter supports the
following '%' expansions:
.RS
.IP "\fB%%\fR"
This is replaced by a literal '%' character.
.IP "\fB%s\fR"
This is replaced by the value of the result attribute. When
result is empty it is skipped.
.IP "\fB%u\fR
When the result attribute value is an address of the form
user@domain, \fB%u\fR is replaced by the local part of the
address. When the result has an empty localpart it is
skipped.
.IP "\fB%d\fR"
When a result attribute value is an address of the form
user@domain, \fB%d\fR is replaced by the domain part of the
attribute value. When the result is unqualified it is
skipped.
.IP "\fB%[SUD1\-9]\fR"
The upper\-case and decimal digit expansions interpolate the
parts of the input key rather than the result. Their behavior
is identical to that described with \fBquery_filter\fR, and
in fact because the input key is known in advance, lookups
whose key does not contain all the information specified
in the result template are suppressed and return no results.
.RE
.IP
For example, using "result_format = smtp:[%s]" allows one
to use a mailHost attribute as the basis of a transport(5)
table. After applying the result format, multiple values
are concatenated as comma separated strings. The expansion_limit
parameter explained below allows one to restrict the number
of values in the result, which is especially useful for
maps that should return a single value.

The default value \fB%s\fR specifies that each
attribute value should be used as is.

NOTE: DO NOT put quotes around the result format! The result
is not a JSON string.
.IP "\fBdomain (default: no domain list)\fR"
This is a list of domain names, paths to files, or "type:table"
databases. When specified, only fully qualified search keys
with a *non\-empty* localpart and a matching domain are
eligible for lookup: 'user' lookups, bare domain lookups
and "@domain" lookups are not performed. This can significantly
reduce the query load on the backend database. Example:
.nf
    domain = postfix.org, hash:/etc/postfix/searchdomains
.fi
.IP "\fBexpansion_limit (default: 0)\fR"
A limit on the total number of result elements returned (as
a comma separated list) by a lookup against the map.  A
setting of zero disables the limit. Lookups fail with a
temporary error if the limit is exceeded. Setting the limit
to 1 ensures that lookups do not return multiple values.
.SH "OBSOLETE MAIN.CF PARAMETERS"
.na
.nf
.ad
.fi
MongoDB parameters can also be defined in main.cf. Specify
as MongoDB source a name that doesn't begin with a slash
or a dot. The MongoDB parameters will then be accessible
as the name you've given the source in its definition, an
underscore, and the name of the parameter. For example, if
a map is specified as "mongodb:\fImongodb_source\fR", the
"uri" parameter would be defined in main.cf as
"\fImongodb_source\fR_uri".

Note: with this form, passwords are written in main.cf,
which is normally world\-readable, and '$' in a mongodb
parameter setting needs to be written as '$$'.
.SH "SEE ALSO"
.na
.nf
postmap(1), Postfix lookup table maintenance
postconf(5), configuration parameters
.SH "README FILES"
.na
.nf
.ad
.fi
Use "\fBpostconf readme_directory\fR" or "\fBpostconf
html_directory\fR" to locate this information.
.na
.nf
DATABASE_README, Postfix lookup table overview
MONGODB_README, Postfix MONGODB client guide
.SH "LICENSE"
.na
.nf
.ad
.fi
The Secure Mailer license must be distributed with this software.
.SH HISTORY
.ad
.fi
MongoDB support was introduced with Postfix version 3.9.
.SH "AUTHOR(S)"
.na
.nf
Hamid Maadani (hamid@dexo.tech)
Dextrous Technologies, LLC

Edited by:
Wietse Venema
porcupine.org

Based on prior work by:
Stephan Ferraro
Aionda GmbH