1TRIVIAL-REWRITE(8) System Manager's Manual TRIVIAL-REWRITE(8)
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6 trivial-rewrite - Postfix address rewriting and resolving daemon
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9 trivial-rewrite [generic Postfix daemon options]
10
12 The trivial-rewrite(8) daemon processes three types of client service
13 requests:
14 rewrite context address
16 Rewrite an address to standard form, according to the address
17 rewriting context:
18 local Append the domain names specified with $myorigin or $my‐
20 domain to incomplete addresses; do swap_bangpath and al‐
21 low_percent_hack processing as described below, and strip
22 source routed addresses (@site,@site:user@domain) to
23 user@domain form.
24 remote Append the domain name specified with $remote_header_re‐
26 write_domain to incomplete addresses. Otherwise the re‐
27 sult is identical to that of the local address rewriting
28 context. This prevents Postfix from appending the local
29 domain to spam from poorly written remote clients.
30 resolve sender address
32 Resolve the address to a (transport, nexthop, recipient, flags)
33 quadruple. The meaning of the results is as follows:
34 transport
36 The delivery agent to use. This is the first field of an
37 entry in the master.cf file.
38 nexthop
40 The host to send to and optional delivery method informa‐
41 tion.
42 recipient
44 The envelope recipient address that is passed on to nex‐
45 thop.
46 flags The address class, whether the address requires relaying,
48 whether the address has problems, and whether the request
49 failed.
50 verify sender address
52 Resolve the address for address verification purposes.
53
55 The trivial-rewrite(8) servers run under control by the Postfix master
56 server. Each server can handle multiple simultaneous connections.
57 When all servers are busy while a client connects, the master creates a
58 new server process, provided that the trivial-rewrite server process
59 limit is not exceeded. Each trivial-rewrite server terminates after
60 serving at least $max_use clients of after $max_idle seconds of idle
61 time.
62
64 None. The command does not interact with the outside world.
65
67 The trivial-rewrite(8) daemon is not security sensitive. By default,
68 this daemon does not talk to remote or local users. It can run at a
69 fixed low privilege in a chrooted environment.
70
72 Problems and transactions are logged to syslogd(8) or postlogd(8).
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75 On busy mail systems a long time may pass before a main.cf change af‐
76 fecting trivial-rewrite(8) is picked up. Use the command "postfix
77 reload" to speed up a change.
78 The text below provides only a parameter summary. See postconf(5) for
80 more details including examples.
81
83 resolve_dequoted_address (yes)
84 Resolve a recipient address safely instead of correctly, by
85 looking inside quotes.
86 Available with Postfix version 2.1 and later:
88 resolve_null_domain (no)
90 Resolve an address that ends in the "@" null domain as if the
91 local hostname were specified, instead of rejecting the address
92 as invalid.
93 Available with Postfix version 2.3 and later:
95 resolve_numeric_domain (no)
97 Resolve "user@ipaddress" as "user@[ipaddress]", instead of re‐
98 jecting the address as invalid.
99 Available with Postfix version 2.5 and later:
101 allow_min_user (no)
103 Allow a sender or recipient address to have `-' as the first
104 character.
105
107 myorigin ($myhostname)
108 The domain name that locally-posted mail appears to come from,
109 and that locally posted mail is delivered to.
110 allow_percent_hack (yes)
112 Enable the rewriting of the form "user%domain" to "user@domain".
113 append_at_myorigin (yes)
115 With locally submitted mail, append the string "@$myorigin" to
116 mail addresses without domain information.
117 append_dot_mydomain (Postfix >= 3.0: no, Postfix < 3.0: yes)
119 With locally submitted mail, append the string ".$mydomain" to
120 addresses that have no ".domain" information.
121 recipient_delimiter (empty)
123 The set of characters that can separate a user name from its ex‐
124 tension (example: user+foo), or a .forward file name from its
125 extension (example: .forward+foo).
126 swap_bangpath (yes)
128 Enable the rewriting of "site!user" into "user@site".
129 Available in Postfix 2.2 and later:
131 remote_header_rewrite_domain (empty)
133 Don't rewrite message headers from remote clients at all when
134 this parameter is empty; otherwise, rewrite message headers and
135 append the specified domain name to incomplete addresses.
136
138 The following is applicable to Postfix version 2.0 and later. Earlier
139 versions do not have support for: virtual_transport, relay_transport,
140 virtual_alias_domains, virtual_mailbox_domains or proxy_interfaces.
141 local_transport (local:$myhostname)
143 The default mail delivery transport and next-hop destination for
144 final delivery to domains listed with mydestination, and for
145 [ipaddress] destinations that match $inet_interfaces or
146 $proxy_interfaces.
147 virtual_transport (virtual)
149 The default mail delivery transport and next-hop destination for
150 final delivery to domains listed with $virtual_mailbox_domains.
151 relay_transport (relay)
153 The default mail delivery transport and next-hop destination for
154 remote delivery to domains listed with $relay_domains.
155 default_transport (smtp)
157 The default mail delivery transport and next-hop destination for
158 destinations that do not match $mydestination, $inet_interfaces,
159 $proxy_interfaces, $virtual_alias_domains, $virtual_mailbox_do‐
160 mains, or $relay_domains.
161 parent_domain_matches_subdomains (see 'postconf -d' output)
163 A list of Postfix features where the pattern "example.com" also
164 matches subdomains of example.com, instead of requiring an ex‐
165 plicit ".example.com" pattern.
166 relayhost (empty)
168 The next-hop destination(s) for non-local mail; overrides
169 non-local domains in recipient addresses.
170 transport_maps (empty)
172 Optional lookup tables with mappings from recipient address to
173 (message delivery transport, next-hop destination).
174 Available in Postfix version 2.3 and later:
176 sender_dependent_relayhost_maps (empty)
178 A sender-dependent override for the global relayhost parameter
179 setting.
180 Available in Postfix version 2.5 and later:
182 empty_address_relayhost_maps_lookup_key (<>)
184 The sender_dependent_relayhost_maps search string that will be
185 used instead of the null sender address.
186 Available in Postfix version 2.7 and later:
188 empty_address_default_transport_maps_lookup_key (<>)
190 The sender_dependent_default_transport_maps search string that
191 will be used instead of the null sender address.
192 sender_dependent_default_transport_maps (empty)
194 A sender-dependent override for the global default_transport pa‐
195 rameter setting.
196
198 Postfix version 2.1 introduces sender and recipient address verifica‐
199 tion. This feature is implemented by sending probe email messages that
200 are not actually delivered. By default, address verification probes
201 use the same route as regular mail. To override specific aspects of
202 message routing for address verification probes, specify one or more of
203 the following:
204 address_verify_local_transport ($local_transport)
206 Overrides the local_transport parameter setting for address ver‐
207 ification probes.
208 address_verify_virtual_transport ($virtual_transport)
210 Overrides the virtual_transport parameter setting for address
211 verification probes.
212 address_verify_relay_transport ($relay_transport)
214 Overrides the relay_transport parameter setting for address ver‐
215 ification probes.
216 address_verify_default_transport ($default_transport)
218 Overrides the default_transport parameter setting for address
219 verification probes.
220 address_verify_relayhost ($relayhost)
222 Overrides the relayhost parameter setting for address verifica‐
223 tion probes.
224 address_verify_transport_maps ($transport_maps)
226 Overrides the transport_maps parameter setting for address veri‐
227 fication probes.
228 Available in Postfix version 2.3 and later:
230 address_verify_sender_dependent_relayhost_maps ($sender_dependent_re‐
232 layhost_maps)
233 Overrides the sender_dependent_relayhost_maps parameter setting
234 for address verification probes.
235 Available in Postfix version 2.7 and later:
237 address_verify_sender_dependent_default_transport_maps ($sender_depen‐
239 dent_default_transport_maps)
240 Overrides the sender_dependent_default_transport_maps parameter
241 setting for address verification probes.
242
244 config_directory (see 'postconf -d' output)
245 The default location of the Postfix main.cf and master.cf con‐
246 figuration files.
247 daemon_timeout (18000s)
249 How much time a Postfix daemon process may take to handle a re‐
250 quest before it is terminated by a built-in watchdog timer.
251 empty_address_recipient (MAILER-DAEMON)
253 The recipient of mail addressed to the null address.
254 ipc_timeout (3600s)
256 The time limit for sending or receiving information over an in‐
257 ternal communication channel.
258 max_idle (100s)
260 The maximum amount of time that an idle Postfix daemon process
261 waits for an incoming connection before terminating voluntarily.
262 max_use (100)
264 The maximal number of incoming connections that a Postfix daemon
265 process will service before terminating voluntarily.
266 relocated_maps (empty)
268 Optional lookup tables with new contact information for users or
269 domains that no longer exist.
270 process_id (read-only)
272 The process ID of a Postfix command or daemon process.
273 process_name (read-only)
275 The process name of a Postfix command or daemon process.
276 queue_directory (see 'postconf -d' output)
278 The location of the Postfix top-level queue directory.
279 show_user_unknown_table_name (yes)
281 Display the name of the recipient table in the "User unknown"
282 responses.
283 syslog_facility (mail)
285 The syslog facility of Postfix logging.
286 syslog_name (see 'postconf -d' output)
288 A prefix that is prepended to the process name in syslog
289 records, so that, for example, "smtpd" becomes "prefix/smtpd".
290 Available in Postfix version 2.0 and later:
292 helpful_warnings (yes)
294 Log warnings about problematic configuration settings, and pro‐
295 vide helpful suggestions.
296 Available in Postfix 3.3 and later:
298 service_name (read-only)
300 The master.cf service name of a Postfix daemon process.
301
303 postconf(5), configuration parameters
304 transport(5), transport table format
305 relocated(5), format of the "user has moved" table
306 master(8), process manager
307 postlogd(8), Postfix logging
308 syslogd(8), system logging
309
311 Use "postconf readme_directory" or "postconf html_directory" to locate
312 this information.
313 ADDRESS_CLASS_README, Postfix address classes howto
314 ADDRESS_VERIFICATION_README, Postfix address verification
315
317 The Secure Mailer license must be distributed with this software.
318
320 Wietse Venema
321 IBM T.J. Watson Research
322 P.O. Box 704
323 Yorktown Heights, NY 10598, USA
324 Wietse Venema
326 Google, Inc.
327 111 8th Avenue
328 New York, NY 10011, USA
329 TRIVIAL-REWRITE(8)