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
20 $mydomain to incomplete addresses; do swap_bangpath and
21 allow_percent_hack processing as described below, and
22 strip source routed addresses (@site,@site:user@domain)
23 to user@domain form.
24 remote Append the domain name specified with $remote_header_re‐
26 write_domain to incomplete addresses. Otherwise the
27 result is identical to that of the local address rewrit‐
28 ing context. This prevents Postfix from appending the
29 local 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 $max_idle seconds of idle
61 time.
62
64 None. The command does not interact with the outside world.
65
67 The trivial-rewrite(8) daemon is not security sensitive. By default,
68 this daemon does not talk to remote or local users. It can run at a
69 fixed low privilege in a chrooted environment.
70
72 Problems and transactions are logged to syslogd(8).
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75 On busy mail systems a long time may pass before a main.cf change
76 affecting trivial-rewrite(8) is picked up. Use the command "postfix
77 reload" to speed up a change.
78 The text below provides only a parameter summary. See postconf(5) for
80 more details including examples.
81
83 resolve_dequoted_address (yes)
84 Resolve a recipient address safely instead of correctly, by
85 looking inside quotes.
86 resolve_null_domain (no)
88 Resolve an address that ends in the "@" null domain as if the
89 local hostname were specified, instead of rejecting the address
90 as invalid.
91 resolve_numeric_domain (no)
93 Resolve "user@ipaddress" as "user@[ipaddress]", instead of
94 rejecting the address as invalid.
95
97 myorigin ($myhostname)
98 The domain name that locally-posted mail appears to come from,
99 and that locally posted mail is delivered to.
100 allow_percent_hack (yes)
102 Enable the rewriting of the form "user%domain" to "user@domain".
103 append_at_myorigin (yes)
105 With locally submitted mail, append the string "@$myorigin" to
106 mail addresses without domain information.
107 append_dot_mydomain (yes)
109 With locally submitted mail, append the string ".$mydomain" to
110 addresses that have no ".domain" information.
111 recipient_delimiter (empty)
113 The separator between user names and address extensions
114 (user+foo).
115 swap_bangpath (yes)
117 Enable the rewriting of "site!user" into "user@site".
118 Available in Postfix 2.2 and later:
120 remote_header_rewrite_domain (empty)
122 Don't rewrite message headers from remote clients at all when
123 this parameter is empty; otherwise, rewrite message headers and
124 append the specified domain name to incomplete addresses.
125
127 The following is applicable to Postfix version 2.0 and later. Earlier
128 versions do not have support for: virtual_transport, relay_transport,
129 virtual_alias_domains, virtual_mailbox_domains or proxy_interfaces.
130 local_transport (local:$myhostname)
132 The default mail delivery transport and next-hop destination for
133 final delivery to domains listed with mydestination, and for
134 [ipaddress] destinations that match $inet_interfaces or
135 $proxy_interfaces.
136 virtual_transport (virtual)
138 The default mail delivery transport and next-hop destination for
139 final delivery to domains listed with $virtual_mailbox_domains.
140 relay_transport (relay)
142 The default mail delivery transport and next-hop destination for
143 remote delivery to domains listed with $relay_domains.
144 default_transport (smtp)
146 The default mail delivery transport and next-hop destination for
147 destinations that do not match $mydestination, $inet_interfaces,
148 $proxy_interfaces, $virtual_alias_domains, $virtual_mail‐
149 box_domains, or $relay_domains.
150 parent_domain_matches_subdomains (see 'postconf -d' output)
152 What Postfix features match subdomains of "domain.tld" automati‐
153 cally, instead of requiring an explicit ".domain.tld" pattern.
154 relayhost (empty)
156 The next-hop destination of non-local mail; overrides non-local
157 domains in recipient addresses.
158 transport_maps (empty)
160 Optional lookup tables with mappings from recipient address to
161 (message delivery transport, next-hop destination).
162 Available in Postfix version 2.3 and later:
164 sender_dependent_relayhost_maps (empty)
166 A sender-dependent override for the global relayhost parameter
167 setting.
168
170 Postfix version 2.1 introduces sender and recipient address verifica‐
171 tion. This feature is implemented by sending probe email messages that
172 are not actually delivered. By default, address verification probes
173 use the same route as regular mail. To override specific aspects of
174 message routing for address verification probes, specify one or more of
175 the following:
176 address_verify_local_transport ($local_transport)
178 Overrides the local_transport parameter setting for address ver‐
179 ification probes.
180 address_verify_virtual_transport ($virtual_transport)
182 Overrides the virtual_transport parameter setting for address
183 verification probes.
184 address_verify_relay_transport ($relay_transport)
186 Overrides the relay_transport parameter setting for address ver‐
187 ification probes.
188 address_verify_default_transport ($default_transport)
190 Overrides the default_transport parameter setting for address
191 verification probes.
192 address_verify_relayhost ($relayhost)
194 Overrides the relayhost parameter setting for address verifica‐
195 tion probes.
196 address_verify_transport_maps ($transport_maps)
198 Overrides the transport_maps parameter setting for address veri‐
199 fication probes.
200 Available in Postfix version 2.3 and later:
202 address_verify_sender_dependent_relayhost_maps (empty)
204 Overrides the sender_dependent_relayhost_maps parameter setting
205 for address verification probes.
206
208 config_directory (see 'postconf -d' output)
209 The default location of the Postfix main.cf and master.cf con‐
210 figuration files.
211 daemon_timeout (18000s)
213 How much time a Postfix daemon process may take to handle a
214 request before it is terminated by a built-in watchdog timer.
215 empty_address_recipient (MAILER-DAEMON)
217 The recipient of mail addressed to the null address.
218 ipc_timeout (3600s)
220 The time limit for sending or receiving information over an
221 internal communication channel.
222 max_idle (100s)
224 The maximum amount of time that an idle Postfix daemon process
225 waits for an incoming connection before terminating voluntarily.
226 max_use (100)
228 The maximal number of incoming connections that a Postfix daemon
229 process will service before terminating voluntarily.
230 relocated_maps (empty)
232 Optional lookup tables with new contact information for users or
233 domains that no longer exist.
234 process_id (read-only)
236 The process ID of a Postfix command or daemon process.
237 process_name (read-only)
239 The process name of a Postfix command or daemon process.
240 queue_directory (see 'postconf -d' output)
242 The location of the Postfix top-level queue directory.
243 show_user_unknown_table_name (yes)
245 Display the name of the recipient table in the "User unknown"
246 responses.
247 syslog_facility (mail)
249 The syslog facility of Postfix logging.
250 syslog_name (postfix)
252 The mail system name that is prepended to the process name in
253 syslog records, so that "smtpd" becomes, for example, "post‐
254 fix/smtpd".
255 Available in Postfix version 2.0 and later:
257 helpful_warnings (yes)
259 Log warnings about problematic configuration settings, and pro‐
260 vide helpful suggestions.
261
263 postconf(5), configuration parameters
264 transport(5), transport table format
265 relocated(5), format of the "user has moved" table
266 master(8), process manager
267 syslogd(8), system logging
268
270 Use "postconf readme_directory" or "postconf html_directory" to locate
271 this information.
272 ADDRESS_CLASS_README, Postfix address classes howto
273 ADDRESS_VERIFICATION_README, Postfix address verification
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276 The Secure Mailer license must be distributed with this software.
277
279 Wietse Venema
280 IBM T.J. Watson Research
281 P.O. Box 704
282 Yorktown Heights, NY 10598, USA
283 TRIVIAL-REWRITE(8)