This file is indexed.

/usr/share/doc/postfix/html/generic.5.html is in postfix-doc 3.1.0-3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN"
        "http://www.w3.org/TR/html4/loose.dtd">
<html> <head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<title> Postfix manual - generic(5) </title>
</head> <body> <pre>
GENERIC(5)                                                          GENERIC(5)

<b>NAME</b>
       generic - Postfix generic table format

<b>SYNOPSIS</b>
       <b>postmap /etc/postfix/generic</b>

       <b>postmap -q "</b><i>string</i><b>" /etc/postfix/generic</b>

       <b>postmap -q - /etc/postfix/generic</b> &lt;<i>inputfile</i>

<b>DESCRIPTION</b>
       The optional <a href="generic.5.html"><b>generic</b>(5)</a> table specifies an address mapping that applies
       when mail is delivered. This is the opposite of  <a href="canonical.5.html"><b>canonical</b>(5)</a>  mapping,
       which applies when mail is received.

       Typically, one would use the <a href="generic.5.html"><b>generic</b>(5)</a> table on a system that does not
       have a valid Internet domain name and that uses something like <i>localdo-</i>
       <i>main.local</i>  instead.   The <a href="generic.5.html"><b>generic</b>(5)</a> table is then used by the <a href="smtp.8.html"><b>smtp</b>(8)</a>
       client to transform local  mail  addresses  into  valid  Internet  mail
       addresses  when mail has to be sent across the Internet.  See the EXAM-
       PLE section at the end of this document.

       The <a href="generic.5.html"><b>generic</b>(5)</a> mapping affects  both  message  header  addresses  (i.e.
       addresses  that  appear inside messages) and message envelope addresses
       (for example, the addresses that are used in SMTP protocol commands).

       Normally, the <a href="generic.5.html"><b>generic</b>(5)</a> table is specified as a text file that  serves
       as input to the <a href="postmap.1.html"><b>postmap</b>(1)</a> command.  The result, an indexed file in <b>dbm</b>
       or <b>db</b> format, is used for fast searching by the  mail  system.  Execute
       the  command  "<b>postmap /etc/postfix/generic</b>" to rebuild an indexed file
       after changing the corresponding text file.

       When the table is provided via other means such as NIS,  LDAP  or  SQL,
       the same lookups are done as for ordinary indexed files.

       Alternatively,  the  table  can be provided as a regular-expression map
       where patterns are given as regular  expressions,  or  lookups  can  be
       directed  to TCP-based server. In those case, the lookups are done in a
       slightly different way as described  below  under  "REGULAR  EXPRESSION
       TABLES" or "TCP-BASED TABLES".

<b>CASE FOLDING</b>
       The  search string is folded to lowercase before database lookup. As of
       Postfix 2.3, the search string is not case folded with  database  types
       such  as  <a href="regexp_table.5.html">regexp</a>: or <a href="pcre_table.5.html">pcre</a>: whose lookup fields can match both upper and
       lower case.

<b>TABLE FORMAT</b>
       The input format for the <a href="postmap.1.html"><b>postmap</b>(1)</a> command is as follows:

       <i>pattern result</i>
              When <i>pattern</i> matches a mail address, replace it  by  the  corre-
              sponding <i>result</i>.

       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.

<b>TABLE SEARCH ORDER</b>
       With  lookups  from  indexed files such as DB or DBM, or from networked
       tables such as NIS, LDAP or SQL, patterns are tried  in  the  order  as
       listed below:

       <i>user</i>@<i>domain address</i>
              Replace <i>user</i>@<i>domain</i> by <i>address</i>. This form has the highest prece-
              dence.

       <i>user address</i>
              Replace <i>user</i>@<i>site</i> by <i>address</i> when <i>site</i> is  equal  to  $<b><a href="postconf.5.html#myorigin">myorigin</a></b>,
              when  <i>site</i>  is listed in $<b><a href="postconf.5.html#mydestination">mydestination</a></b>, or when it is listed in
              $<b><a href="postconf.5.html#inet_interfaces">inet_interfaces</a></b> or $<b><a href="postconf.5.html#proxy_interfaces">proxy_interfaces</a></b>.

       @<i>domain address</i>
              Replace other addresses in <i>domain</i> by <i>address</i>.  This form has the
              lowest precedence.

<b>RESULT ADDRESS REWRITING</b>
       The lookup result is subject to address rewriting:

       <b>o</b>      When  the  result  has the form @<i>otherdomain</i>, the result becomes
              the same <i>user</i> in <i>otherdomain</i>.

       <b>o</b>      When "<b><a href="postconf.5.html#append_at_myorigin">append_at_myorigin</a>=yes</b>", append "<b>@$<a href="postconf.5.html#myorigin">myorigin</a></b>" to  addresses
              without "@domain".

       <b>o</b>      When "<b><a href="postconf.5.html#append_dot_mydomain">append_dot_mydomain</a>=yes</b>", append "<b>.$<a href="postconf.5.html#mydomain">mydomain</a></b>" to addresses
              without ".domain".

<b>ADDRESS EXTENSION</b>
       When a mail address localpart contains the optional recipient delimiter
       (e.g.,  <i>user+foo</i>@<i>domain</i>),  the  lookup  order becomes: <i>user+foo</i>@<i>domain</i>,
       <i>user</i>@<i>domain</i>, <i>user+foo</i>, <i>user</i>, and @<i>domain</i>.

       The  <b><a href="postconf.5.html#propagate_unmatched_extensions">propagate_unmatched_extensions</a></b>  parameter  controls   whether   an
       unmatched address extension (<i>+foo</i>) is propagated to the result of table
       lookup.

<b>REGULAR EXPRESSION TABLES</b>
       This section describes how the table lookups change when the  table  is
       given  in the form of regular expressions. For a description of regular
       expression lookup table syntax, see <a href="regexp_table.5.html"><b>regexp_table</b>(5)</a> or <a href="pcre_table.5.html"><b>pcre_table</b>(5)</a>.

       Each pattern is a regular expression that  is  applied  to  the  entire
       address  being looked up. Thus, <i>user@domain</i> mail addresses are not bro-
       ken up into their <i>user</i> and <i>@domain</i> constituent parts, nor  is  <i>user+foo</i>
       broken up into <i>user</i> and <i>foo</i>.

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

       Results are the same as with indexed file lookups, with the  additional
       feature  that parenthesized substrings from the pattern can be interpo-
       lated as <b>$1</b>, <b>$2</b> and so on.

<b>TCP-BASED TABLES</b>
       This section describes how the table lookups change  when  lookups  are
       directed   to  a  TCP-based  server.  For  a  description  of  the  TCP
       client/server lookup protocol, see <a href="tcp_table.5.html"><b>tcp_table</b>(5)</a>.  This feature  is  not
       available up to and including Postfix version 2.4.

       Each  lookup operation uses the entire address once.  Thus, <i>user@domain</i>
       mail addresses are not broken up  into  their  <i>user</i>  and  <i>@domain</i>  con-
       stituent parts, nor is <i>user+foo</i> broken up into <i>user</i> and <i>foo</i>.

       Results are the same as with indexed file lookups.

<b>EXAMPLE</b>
       The  following shows a generic mapping with an indexed file.  When mail
       is sent to a remote host via SMTP, this replaces  <i>his@localdomain.local</i>
       by his ISP mail address, replaces <i>her@localdomain.local</i> by her ISP mail
       address, and replaces other local addresses by his ISP account, with an
       address extension of <i>+local</i> (this example assumes that the ISP supports
       "+" style address extensions).

       /etc/postfix/<a href="postconf.5.html">main.cf</a>:
           <a href="postconf.5.html#smtp_generic_maps">smtp_generic_maps</a> = <a href="DATABASE_README.html#types">hash</a>:/etc/postfix/generic

       /etc/postfix/generic:
           his@localdomain.local   hisaccount@hisisp.example
           her@localdomain.local   heraccount@herisp.example
           @localdomain.local      hisaccount+local@hisisp.example

       Execute the command "<b>postmap /etc/postfix/generic</b>" whenever  the  table
       is  changed.   Instead of <b>hash</b>, some systems use <b>dbm</b> database files. To
       find out what tables your system supports  use  the  command  "<b>postconf</b>
       <b>-m</b>".

<b>BUGS</b>
       The table format does not understand quoting conventions.

<b>CONFIGURATION PARAMETERS</b>
       The  following  <a href="postconf.5.html"><b>main.cf</b></a>  parameters  are especially relevant.  The text
       below provides only a  parameter  summary.  See  <a href="postconf.5.html"><b>postconf</b>(5)</a>  for  more
       details including examples.

       <b><a href="postconf.5.html#smtp_generic_maps">smtp_generic_maps</a></b>
              Address  mapping lookup table for envelope and header sender and
              recipient addresses while delivering mail via SMTP.

       <b><a href="postconf.5.html#propagate_unmatched_extensions">propagate_unmatched_extensions</a></b>
              A list of address rewriting or forwarding mechanisms that propa-
              gate  an  address  extension  from  the  original address to the
              result.  Specify zero or more of <b>canonical</b>, <b>virtual</b>, <b>alias</b>, <b>for-</b>
              <b>ward</b>, <b>include</b>, or <b>generic</b>.

       Other parameters of interest:

       <b><a href="postconf.5.html#inet_interfaces">inet_interfaces</a></b>
              The  network  interface addresses that this system receives mail
              on.  You need to stop and  start  Postfix  when  this  parameter
              changes.

       <b><a href="postconf.5.html#proxy_interfaces">proxy_interfaces</a></b>
              Other  interfaces that this machine receives mail on by way of a
              proxy agent or network address translator.

       <b><a href="postconf.5.html#mydestination">mydestination</a></b>
              List of domains that this mail system considers local.

       <b><a href="postconf.5.html#myorigin">myorigin</a></b>
              The domain that is appended to locally-posted mail.

       <b><a href="postconf.5.html#owner_request_special">owner_request_special</a></b>
              Give special treatment to <b>owner-</b><i>xxx</i> and <i>xxx</i><b>-request</b> addresses.

<b>SEE ALSO</b>
       <a href="postmap.1.html">postmap(1)</a>, Postfix lookup table manager
       <a href="postconf.5.html">postconf(5)</a>, configuration parameters
       <a href="smtp.8.html">smtp(8)</a>, Postfix SMTP client

<b>README FILES</b>
       <a href="ADDRESS_REWRITING_README.html">ADDRESS_REWRITING_README</a>, address rewriting guide
       <a href="DATABASE_README.html">DATABASE_README</a>, Postfix lookup table overview
       <a href="STANDARD_CONFIGURATION_README.html">STANDARD_CONFIGURATION_README</a>, configuration examples

<b>LICENSE</b>
       The Secure Mailer license must be distributed with this software.

<b>HISTORY</b>
       A genericstable feature appears in the Sendmail MTA.

       This feature is available in Postfix 2.2 and later.

<b>AUTHOR(S)</b>
       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

                                                                    GENERIC(5)
</pre> </body> </html>