transport.5.html revision 1.1.1.3
1 1.1 tron <!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN" 2 1.1 tron "http://www.w3.org/TR/html4/loose.dtd"> 3 1.1 tron <html> <head> 4 1.1 tron <meta http-equiv="Content-Type" content="text/html; charset=us-ascii"> 5 1.1 tron <title> Postfix manual - transport(5) </title> 6 1.1 tron </head> <body> <pre> 7 1.1 tron TRANSPORT(5) TRANSPORT(5) 8 1.1 tron 9 1.1 tron <b>NAME</b> 10 1.1 tron transport - Postfix transport table format 11 1.1 tron 12 1.1 tron <b>SYNOPSIS</b> 13 1.1 tron <b>postmap /etc/postfix/transport</b> 14 1.1 tron 15 1.1 tron <b>postmap -q "</b><i>string</i><b>" /etc/postfix/transport</b> 16 1.1 tron 17 1.1 tron <b>postmap -q - /etc/postfix/transport</b> <<i>inputfile</i> 18 1.1 tron 19 1.1 tron <b>DESCRIPTION</b> 20 1.1.1.3 tron The optional <a href="transport.5.html"><b>transport</b>(5)</a> table specifies a mapping from email 21 1.1.1.3 tron addresses to message delivery transports and next-hop destinations. 22 1.1.1.3 tron Message delivery transports such as <b>local</b> or <b>smtp</b> are defined in the 23 1.1.1.3 tron <a href="master.5.html"><b>master.cf</b></a> file, and next-hop destinations are typically hosts or domain 24 1.1.1.3 tron names. The table is searched by the <a href="trivial-rewrite.8.html"><b>trivial-rewrite</b>(8)</a> daemon. 25 1.1 tron 26 1.1.1.3 tron This mapping overrides the default <i>transport</i>:<i>nexthop</i> selection that is 27 1.1.1.3 tron built into Postfix: 28 1.1 tron 29 1.1 tron <b><a href="postconf.5.html#local_transport">local_transport</a> (default: <a href="local.8.html">local</a>:$<a href="postconf.5.html#myhostname">myhostname</a>)</b> 30 1.1.1.3 tron This is the default for final delivery to domains listed with 31 1.1.1.3 tron <b><a href="postconf.5.html#mydestination">mydestination</a></b>, and for [<i>ipaddress</i>] destinations that match 32 1.1.1.3 tron <b>$<a href="postconf.5.html#inet_interfaces">inet_interfaces</a></b> or <b>$<a href="postconf.5.html#proxy_interfaces">proxy_interfaces</a></b>. The default <i>nexthop</i> des- 33 1.1.1.3 tron tination is the MTA hostname. 34 1.1 tron 35 1.1 tron <b><a href="postconf.5.html#virtual_transport">virtual_transport</a> (default: <a href="virtual.8.html">virtual</a>:)</b> 36 1.1.1.3 tron This is the default for final delivery to domains listed with 37 1.1.1.3 tron <b><a href="postconf.5.html#virtual_mailbox_domains">virtual_mailbox_domains</a></b>. The default <i>nexthop</i> destination is the 38 1.1.1.3 tron recipient domain. 39 1.1 tron 40 1.1 tron <b><a href="postconf.5.html#relay_transport">relay_transport</a> (default: relay:)</b> 41 1.1.1.3 tron This is the default for remote delivery to domains listed with 42 1.1.1.3 tron <b><a href="postconf.5.html#relay_domains">relay_domains</a></b>. In order of decreasing precedence, the <i>nexthop</i> 43 1.1.1.3 tron destination is taken from <b><a href="postconf.5.html#relay_transport">relay_transport</a></b>, <b><a href="postconf.5.html#sender_dependent_relayhost_maps">sender_depen</a>-</b> 44 1.1.1.3 tron <b><a href="postconf.5.html#sender_dependent_relayhost_maps">dent_relayhost_maps</a></b>, <b><a href="postconf.5.html#relayhost">relayhost</a></b>, or from the recipient domain. 45 1.1 tron 46 1.1 tron <b><a href="postconf.5.html#default_transport">default_transport</a> (default: <a href="smtp.8.html">smtp</a>:)</b> 47 1.1.1.3 tron This is the default for remote delivery to other destinations. 48 1.1.1.3 tron In order of decreasing precedence, the <i>nexthop</i> destination is 49 1.1.1.3 tron taken from <b><a href="postconf.5.html#sender_dependent_default_transport_maps">sender_dependent_default_transport_maps</a>,</b> 50 1.1.1.3 tron <b><a href="postconf.5.html#default_transport">default_transport</a></b>, <b><a href="postconf.5.html#sender_dependent_relayhost_maps">sender_dependent_relayhost_maps</a></b>, <b><a href="postconf.5.html#relayhost">relayhost</a></b>, 51 1.1.1.3 tron or from the recipient domain. 52 1.1.1.3 tron 53 1.1.1.3 tron Normally, the <a href="transport.5.html"><b>transport</b>(5)</a> table is specified as a text file that 54 1.1.1.3 tron serves as input to the <a href="postmap.1.html"><b>postmap</b>(1)</a> command. The result, an indexed file 55 1.1.1.3 tron in <b>dbm</b> or <b>db</b> format, is used for fast searching by the mail system. 56 1.1.1.3 tron Execute the command "<b>postmap /etc/postfix/transport</b>" to rebuild an 57 1.1.1.3 tron indexed file after changing the corresponding transport table. 58 1.1.1.3 tron 59 1.1.1.3 tron When the table is provided via other means such as NIS, LDAP or SQL, 60 1.1.1.3 tron the same lookups are done as for ordinary indexed files. 61 1.1.1.3 tron 62 1.1.1.3 tron Alternatively, the table can be provided as a regular-expression map 63 1.1.1.3 tron where patterns are given as regular expressions, or lookups can be 64 1.1.1.3 tron directed to TCP-based server. In those case, the lookups are done in a 65 1.1.1.3 tron slightly different way as described below under "REGULAR EXPRESSION 66 1.1.1.3 tron TABLES" or "TCP-BASED TABLES". 67 1.1 tron 68 1.1 tron <b>CASE FOLDING</b> 69 1.1.1.3 tron The search string is folded to lowercase before database lookup. As of 70 1.1.1.3 tron Postfix 2.3, the search string is not case folded with database types 71 1.1.1.3 tron 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 72 1.1.1.3 tron lower case. 73 1.1 tron 74 1.1 tron <b>TABLE FORMAT</b> 75 1.1 tron The input format for the <a href="postmap.1.html"><b>postmap</b>(1)</a> command is as follows: 76 1.1 tron 77 1.1 tron <i>pattern result</i> 78 1.1.1.3 tron When <i>pattern</i> matches the recipient address or domain, use the 79 1.1.1.3 tron corresponding <i>result</i>. 80 1.1 tron 81 1.1 tron blank lines and comments 82 1.1.1.3 tron Empty lines and whitespace-only lines are ignored, as are lines 83 1.1.1.3 tron whose first non-whitespace character is a `#'. 84 1.1 tron 85 1.1 tron multi-line text 86 1.1.1.3 tron A logical line starts with non-whitespace text. A line that 87 1.1.1.3 tron starts with whitespace continues a logical line. 88 1.1.1.3 tron 89 1.1.1.3 tron The <i>pattern</i> specifies an email address, a domain name, or a domain name 90 1.1.1.3 tron hierarchy, as described in section "TABLE LOOKUP". 91 1.1.1.3 tron 92 1.1.1.3 tron The <i>result</i> is of the form <i>transport:nexthop</i> and specifies how or where 93 1.1.1.3 tron to deliver mail. This is described in section "RESULT FORMAT". 94 1.1 tron 95 1.1 tron <b>TABLE SEARCH ORDER</b> 96 1.1.1.3 tron With lookups from indexed files such as DB or DBM, or from networked 97 1.1.1.3 tron tables such as NIS, LDAP or SQL, patterns are tried in the order as 98 1.1.1.3 tron listed below: 99 1.1 tron 100 1.1 tron <i>user+extension@domain transport</i>:<i>nexthop</i> 101 1.1.1.3 tron Deliver mail for <i>user+extension@domain</i> through <i>transport</i> to <i>nex-</i> 102 1.1.1.3 tron <i>thop</i>. 103 1.1 tron 104 1.1 tron <i>user@domain transport</i>:<i>nexthop</i> 105 1.1.1.3 tron Deliver mail for <i>user@domain</i> through <i>transport</i> to <i>nexthop</i>. 106 1.1 tron 107 1.1 tron <i>domain transport</i>:<i>nexthop</i> 108 1.1.1.3 tron Deliver mail for <i>domain</i> through <i>transport</i> to <i>nexthop</i>. 109 1.1 tron 110 1.1 tron <i>.domain transport</i>:<i>nexthop</i> 111 1.1.1.3 tron Deliver mail for any subdomain of <i>domain</i> through <i>transport</i> to 112 1.1.1.3 tron <i>nexthop</i>. This applies only when the string <b><a href="postconf.5.html#transport_maps">transport_maps</a></b> is not 113 1.1.1.3 tron listed in the <b><a href="postconf.5.html#parent_domain_matches_subdomains">parent_domain_matches_subdomains</a></b> configuration 114 1.1.1.3 tron setting. Otherwise, a domain name matches itself and its subdo- 115 1.1.1.3 tron mains. 116 1.1 tron 117 1.1 tron <b>*</b> <i>transport</i>:<i>nexthop</i> 118 1.1.1.3 tron The special pattern <b>*</b> represents any address (i.e. it functions 119 1.1.1.3 tron as the wild-card pattern, and is unique to Postfix transport 120 1.1.1.3 tron tables). 121 1.1.1.3 tron 122 1.1.1.3 tron Note 1: the null recipient address is looked up as 123 1.1.1.3 tron <b>$<a href="postconf.5.html#empty_address_recipient">empty_address_recipient</a></b>@<b>$<a href="postconf.5.html#myhostname">myhostname</a></b> (default: mailer-daemon@hostname). 124 1.1 tron 125 1.1.1.3 tron Note 2: <i>user@domain</i> or <i>user+extension@domain</i> lookup is available in 126 1.1.1.3 tron Postfix 2.0 and later. 127 1.1 tron 128 1.1 tron <b>RESULT FORMAT</b> 129 1.1.1.3 tron The lookup result is of the form <i>transport</i><b>:</b><i>nexthop</i>. The <i>transport</i> 130 1.1.1.3 tron field specifies a mail delivery transport such as <b>smtp</b> or <b>local</b>. The 131 1.1.1.3 tron <i>nexthop</i> field specifies where and how to deliver mail. 132 1.1.1.3 tron 133 1.1.1.3 tron The transport field specifies the name of a mail delivery transport 134 1.1.1.3 tron (the first name of a mail delivery service entry in the Postfix <a href="master.5.html"><b>mas-</b> 135 1.1.1.3 tron <b>ter.cf</b></a> file). 136 1.1.1.3 tron 137 1.1.1.3 tron The interpretation of the nexthop field is transport dependent. In the 138 1.1.1.3 tron case of SMTP, specify a service on a non-default port as <i>host</i>:<i>service</i>, 139 1.1.1.3 tron and disable MX (mail exchanger) DNS lookups with [<i>host</i>] or [<i>host</i>]:<i>port</i>. 140 1.1.1.3 tron The [] form is required when you specify an IP address instead of a 141 1.1.1.3 tron hostname. 142 1.1.1.3 tron 143 1.1.1.3 tron A null <i>transport</i> and null <i>nexthop</i> result means "do not change": use the 144 1.1.1.3 tron delivery transport and nexthop information that would be used when the 145 1.1.1.3 tron entire transport table did not exist. 146 1.1 tron 147 1.1.1.3 tron A non-null <i>transport</i> field with a null <i>nexthop</i> field resets the nexthop 148 1.1.1.3 tron information to the recipient domain. 149 1.1 tron 150 1.1.1.3 tron A null <i>transport</i> field with non-null <i>nexthop</i> field does not modify the 151 1.1.1.3 tron transport information. 152 1.1 tron 153 1.1 tron <b>EXAMPLES</b> 154 1.1.1.3 tron In order to deliver internal mail directly, while using a mail relay 155 1.1.1.3 tron for all other mail, specify a null entry for internal destinations (do 156 1.1.1.3 tron not change the delivery transport or the nexthop information) and spec- 157 1.1.1.3 tron ify a wildcard for all other destinations. 158 1.1 tron 159 1.1 tron <b>my.domain :</b> 160 1.1 tron <b>.my.domain :</b> 161 1.1 tron <b>* <a href="smtp.8.html">smtp</a>:outbound-relay.my.domain</b> 162 1.1 tron 163 1.1.1.3 tron In order to send mail for <b>example.com</b> and its subdomains via the <b>uucp</b> 164 1.1.1.3 tron transport to the UUCP host named <b>example</b>: 165 1.1 tron 166 1.1 tron <b>example.com uucp:example</b> 167 1.1 tron <b>.example.com uucp:example</b> 168 1.1 tron 169 1.1.1.3 tron When no nexthop host name is specified, the destination domain name is 170 1.1.1.3 tron used instead. For example, the following directs mail for <i>user</i>@<b>exam-</b> 171 1.1.1.3 tron <b>ple.com</b> via the <b>slow</b> transport to a mail exchanger for <b>example.com</b>. 172 1.1.1.3 tron The <b>slow</b> transport could be configured to run at most one delivery 173 1.1.1.3 tron process at a time: 174 1.1 tron 175 1.1 tron <b>example.com slow:</b> 176 1.1 tron 177 1.1.1.3 tron When no transport is specified, Postfix uses the transport that matches 178 1.1.1.3 tron the address domain class (see DESCRIPTION above). The following sends 179 1.1.1.3 tron all mail for <b>example.com</b> and its subdomains to host <b>gateway.exam-</b> 180 1.1.1.3 tron <b>ple.com</b>: 181 1.1 tron 182 1.1 tron <b>example.com :[gateway.example.com]</b> 183 1.1 tron <b>.example.com :[gateway.example.com]</b> 184 1.1 tron 185 1.1.1.3 tron In the above example, the [] suppress MX lookups. This prevents mail 186 1.1.1.3 tron routing loops when your machine is primary MX host for <b>example.com</b>. 187 1.1 tron 188 1.1.1.3 tron In the case of delivery via SMTP, one may specify <i>hostname</i>:<i>service</i> 189 1.1.1.3 tron instead of just a host: 190 1.1 tron 191 1.1 tron <b>example.com <a href="smtp.8.html">smtp</a>:bar.example:2025</b> 192 1.1 tron 193 1.1.1.3 tron This directs mail for <i>user</i>@<b>example.com</b> to host <b>bar.example</b> port <b>2025</b>. 194 1.1.1.3 tron Instead of a numerical port a symbolic name may be used. Specify [] 195 1.1.1.3 tron around the hostname if MX lookups must be disabled. 196 1.1 tron 197 1.1 tron The error mailer can be used to bounce mail: 198 1.1 tron 199 1.1 tron <b>.example.com <a href="error.8.html">error</a>:mail for *.example.com is not deliverable</b> 200 1.1 tron 201 1.1.1.3 tron This causes all mail for <i>user</i>@<i>anything</i><b>.example.com</b> to be bounced. 202 1.1 tron 203 1.1 tron <b>REGULAR EXPRESSION TABLES</b> 204 1.1.1.3 tron This section describes how the table lookups change when the table is 205 1.1.1.3 tron given in the form of regular expressions. For a description of regular 206 1.1.1.3 tron 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>. 207 1.1.1.3 tron 208 1.1.1.3 tron Each pattern is a regular expression that is applied to the entire 209 1.1.1.3 tron address being looked up. Thus, <i>some.domain.hierarchy</i> is not looked up 210 1.1.1.3 tron via its parent domains, nor is <i>user+foo@domain</i> looked up as 211 1.1.1.3 tron <i>user@domain</i>. 212 1.1.1.3 tron 213 1.1.1.3 tron Patterns are applied in the order as specified in the table, until a 214 1.1.1.3 tron pattern is found that matches the search string. 215 1.1.1.3 tron 216 1.1.1.3 tron The <a href="trivial-rewrite.8.html"><b>trivial-rewrite</b>(8)</a> server disallows regular expression substitution 217 1.1.1.3 tron of $1 etc. in regular expression lookup tables, because that could open 218 1.1.1.3 tron a security hole (Postfix version 2.3 and later). 219 1.1 tron 220 1.1 tron <b>TCP-BASED TABLES</b> 221 1.1.1.3 tron This section describes how the table lookups change when lookups are 222 1.1.1.3 tron directed to a TCP-based server. For a description of the TCP 223 1.1.1.3 tron client/server lookup protocol, see <a href="tcp_table.5.html"><b>tcp_table</b>(5)</a>. This feature is not 224 1.1.1.3 tron available up to and including Postfix version 2.4. 225 1.1.1.3 tron 226 1.1.1.3 tron Each lookup operation uses the entire recipient address once. Thus, 227 1.1.1.3 tron <i>some.domain.hierarchy</i> is not looked up via its parent domains, nor is 228 1.1.1.3 tron <i>user+foo@domain</i> looked up as <i>user@domain</i>. 229 1.1 tron 230 1.1 tron Results are the same as with indexed file lookups. 231 1.1 tron 232 1.1 tron <b>CONFIGURATION PARAMETERS</b> 233 1.1.1.3 tron The following <a href="postconf.5.html"><b>main.cf</b></a> parameters are especially relevant. The text 234 1.1.1.3 tron below provides only a parameter summary. See <a href="postconf.5.html"><b>postconf</b>(5)</a> for more 235 1.1.1.3 tron details including examples. 236 1.1 tron 237 1.1 tron <b><a href="postconf.5.html#empty_address_recipient">empty_address_recipient</a></b> 238 1.1.1.3 tron The address that is looked up instead of the null sender 239 1.1.1.3 tron address. 240 1.1 tron 241 1.1 tron <b><a href="postconf.5.html#parent_domain_matches_subdomains">parent_domain_matches_subdomains</a></b> 242 1.1.1.3 tron List of Postfix features that use <i>domain.tld</i> patterns to match 243 1.1.1.3 tron <i>sub.domain.tld</i> (as opposed to requiring <i>.domain.tld</i> patterns). 244 1.1 tron 245 1.1 tron <b><a href="postconf.5.html#transport_maps">transport_maps</a></b> 246 1.1 tron List of transport lookup tables. 247 1.1 tron 248 1.1 tron <b>SEE ALSO</b> 249 1.1 tron <a href="trivial-rewrite.8.html">trivial-rewrite(8)</a>, rewrite and resolve addresses 250 1.1 tron <a href="master.5.html">master(5)</a>, <a href="master.5.html">master.cf</a> file format 251 1.1 tron <a href="postconf.5.html">postconf(5)</a>, configuration parameters 252 1.1 tron <a href="postmap.1.html">postmap(1)</a>, Postfix lookup table manager 253 1.1 tron 254 1.1 tron <b>README FILES</b> 255 1.1 tron <a href="ADDRESS_REWRITING_README.html">ADDRESS_REWRITING_README</a>, address rewriting guide 256 1.1 tron <a href="DATABASE_README.html">DATABASE_README</a>, Postfix lookup table overview 257 1.1 tron <a href="FILTER_README.html">FILTER_README</a>, external content filter 258 1.1 tron 259 1.1 tron <b>LICENSE</b> 260 1.1.1.3 tron The Secure Mailer license must be distributed with this software. 261 1.1 tron 262 1.1 tron <b>AUTHOR(S)</b> 263 1.1 tron Wietse Venema 264 1.1 tron IBM T.J. Watson Research 265 1.1 tron P.O. Box 704 266 1.1 tron Yorktown Heights, NY 10598, USA 267 1.1 tron 268 1.1 tron TRANSPORT(5) 269 1.1 tron </pre> </body> </html> 270
Indexes created Sun Jun 07 00:24:08 UTC 2026