1 files changed, 103 insertions, 56 deletions
diff --git a/html/ADDRESS_REWRITING_README.html b/html/ADDRESS_REWRITING_README.html
index 85e296f..c92a314 100644
--- a/html/ADDRESS_REWRITING_README.html
+++ b/html/ADDRESS_REWRITING_README.html
@@ -94,9 +94,7 @@ as invalid </a>
 
 <ul>
 
-<li> <a href="#resolve"> Resolve address to destination </a>
-
-<li> <a href="#transport"> Mail transport switch </a>
+<li> <a href="#resolve"> Resolve address to (transport, next-hop destination) </a>
 
 <li> <a href="#relocated"> Relocated users table </a>
 
@@ -312,8 +310,8 @@ find what you need.  </p>
 <table border="1">
 
 <tr> <th nowrap> Address manipulation </th> <th nowrap> Scope </th>
-<th> Daemon </th> <th nowrap> Global turn-on control </th> <th nowrap> Selective
-turn-off control </th> </tr>
+<th> Daemon </th> <th nowrap> Turn-on controls </th> <th nowrap> 
+Turn-off controls </th> </tr>
 
 <tr> <td> <a href="#standard"> Rewrite addresses to standard form</a>
 </td> <td nowrap> all mail </td> <td> <a href="trivial-rewrite.8.html">trivial-<br>rewrite(8)</a> </td>
@@ -340,13 +338,12 @@ nowrap> all mail </td> <td> <a href="cleanup.8.html">cleanup(8)</a> </td> <td> <
 nowrap> all mail </td> <td> <a href="cleanup.8.html">cleanup(8)</a> </td> <td> <a href="postconf.5.html#virtual_alias_maps">virtual_alias_maps</a>
 </td> <td> <a href="postconf.5.html#receive_override_options">receive_override_options</a> </td> </tr>
 
-<tr> <td> <a href="#resolve"> Resolve address to destination </a>
-</td> <td nowrap> all mail </td> <td> <a href="trivial-rewrite.8.html">trivial-<br>rewrite(8)</a> </td>
-<td> none </td> <td> none </td> </tr>
-
-<tr> <td> <a href="#transport"> Mail transport switch</a> </td>
-<td nowrap> all mail </td> <td> <a href="trivial-rewrite.8.html">trivial-<br>rewrite(8)</a> </td> <td>
-<a href="postconf.5.html#transport_maps">transport_maps</a> </td> <td> none </td> </tr>
+<tr> <td> <a href="#resolve"> Resolve address to (transport, next-hop
+destination) </a> </td> <td nowrap> all mail </td> <td>
+<a href="trivial-rewrite.8.html">trivial-<br>rewrite(8)</a> </td> <td> <a href="postconf.5.html#local_transport">local_transport</a>, <a href="postconf.5.html#virtual_transport">virtual_transport</a>,
+<a href="postconf.5.html#relay_transport">relay_transport</a>, <a href="postconf.5.html#default_transport">default_transport</a>, <a href="postconf.5.html#relayhost">relayhost</a>,
+<a href="postconf.5.html#sender_dependent_relayhost_maps">sender_dependent_relayhost_maps</a>, <a href="postconf.5.html#sender_dependent_default_transport_maps">sender_dependent_default_transport_maps</a>
+</td> <td> <a href="postconf.5.html#content_filter">content_filter</a> </td> </tr>
 
 <tr> <td> <a href="#relocated"> Relocated users table</a> </td>
 <td nowrap> all mail </td> <td> <a href="trivial-rewrite.8.html">trivial-<br>rewrite(8)</a> </td> <td>
@@ -774,6 +771,11 @@ may be a more appropriate vehicle. See the <a href="VIRTUAL_README.html">VIRTUAL
 for an overview of methods to host virtual domains with Postfix.
 </p>
 
+<p> Note: <a href="ADDRESS_REWRITING_README.html#virtual">virtual aliasing</a> (<a href="postconf.5.html#virtual_alias_maps">virtual_alias_maps</a>) applies to all
+recipients: <a href="local.8.html">local(8)</a>, virtual, and remote.  <!-- wrap filler -->
+This is unlike <a href="ADDRESS_REWRITING_README.html#aliases">local aliasing</a> (<a href="postconf.5.html#alias_maps">alias_maps</a>) which applies only to
+<a href="local.8.html">local(8)</a> recipients. </p>
+
 <p> Virtual aliasing is disabled by default. To enable, edit the
 <a href="postconf.5.html#virtual_alias_maps">virtual_alias_maps</a> parameter in the <a href="postconf.5.html">main.cf</a> file and
 specify one or more lookup tables, separated by whitespace or
@@ -792,7 +794,7 @@ commas. </p>
 </blockquote>
 
 <p> Addresses found in virtual alias maps are subjected to another
-iteration of virtual aliasing, but are not subjected to canonical
+iteration of <a href="ADDRESS_REWRITING_README.html#virtual">virtual aliasing</a>, but are not subjected to canonical
 mapping, in order to avoid loops. </p>
 
 <p> For static mappings as shown above, lookup tables such as <a href="DATABASE_README.html#types">hash</a>:,
@@ -833,9 +835,8 @@ manager delegates the more complex address manipulations to the
 
 <ul>
 
-<li> <a href="#resolve"> Resolve address to destination </a>
-
-<li> <a href="#transport"> Mail transport switch</a>
+<li> <a href="#resolve"> Resolve address to (transport, next-hop
+destination) </a>
 
 <li> <a href="#relocated"> Relocated users table</a>
 
@@ -873,67 +874,108 @@ via the <a href="local.8.html">local(8)</a> delivery agent: </p>
 step in more detail, with specific examples or with pointers to
 documentation with examples. </p>
 
-<h3> <a name="resolve"> Resolve address to destination </a> </h3>
+<h3> <a name="resolve"> Resolve address to (transport, next-hop
+destination) </a> </h3>
 
 <p> The Postfix <a href="qmgr.8.html">qmgr(8)</a> queue manager selects new mail from the
-<a href="QSHAPE_README.html#incoming_queue">incoming queue</a> or old mail from the <a href="QSHAPE_README.html#deferred_queue">deferred queue</a>, and asks the
-<a href="trivial-rewrite.8.html">trivial-rewrite(8)</a> address rewriting and resolving daemon where it
-should be delivered. </p>
+<a href="QSHAPE_README.html#incoming_queue">incoming queue</a> or old mail from the <a href="QSHAPE_README.html#deferred_queue">deferred queue</a>. First it
+looks for overrides: </p>
+
+<ul>
 
-<p> As of version 2.0, Postfix distinguishes four major address
-classes. Each class has its own list of domain names, and each
-class has its own default delivery method, as shown in the table
-below.  See the <a href="ADDRESS_CLASS_README.html">ADDRESS_CLASS_README</a> document for the fine details.
-Postfix versions before 2.0 only distinguish between local delivery
-and everything else.  </p>
+<li> <p> The REDIRECT action in <a href="access.5.html">access(5)</a>, <a href="header_checks.5.html">header_checks(5)</a> or
+<a href="header_checks.5.html">body_checks(5)</a> overrides all recipients of the message, and overrides
+a <a href="postconf.5.html#content_filter">content_filter</a> setting, and FILTER action in <a href="access.5.html">access(5)</a>,
+<a href="header_checks.5.html">header_checks(5)</a> or <a href="header_checks.5.html">body_checks(5)</a>. The REDIRECT action was implemented
+as a short-cut to retaliate for abuse. </p>
+
+<li> <p> A <a href="postconf.5.html#content_filter">content_filter</a> setting and FILTER action in <a href="access.5.html">access(5)</a>,
+<a href="header_checks.5.html">header_checks(5)</a> or <a href="header_checks.5.html">body_checks(5)</a> provide their own (transport,
+next-hop destination) information. This bypasses all the steps that
+are described in the remainder of this section. </p>
+
+</ul>
+
+<p> When there is no content filter override, the <a href="qmgr.8.html">qmgr(8)</a> queue
+manager asks the <a href="trivial-rewrite.8.html">trivial-rewrite(8)</a> address rewriting and resolving
+daemon for each recipient how to deliver it (which message delivery
+transport) and where to deliver it (what next-hop destination). </p>
+
+<p> As of version 2.0, Postfix distinguishes four major domain
+classes. Each class has its own list of recipient domain names, and
+each class has its own delivery method, as shown in the table below.
+See the <a href="ADDRESS_CLASS_README.html">ADDRESS_CLASS_README</a> document for the fine details.  Postfix
+versions before 2.0 only distinguish between local delivery and
+everything else. </p>
+
+<p> Note that the table does not match recipients against
+<a href="postconf.5.html#virtual_alias_domains">virtual_alias_domains</a>. The reason is that all valid recipients in
+a <a href="ADDRESS_CLASS_README.html#virtual_alias_class">virtual alias domain</a> must be aliased to an address in a different
+domain. All other recipients in a <a href="ADDRESS_CLASS_README.html#virtual_alias_class">virtual alias domain</a> are by
+definition undeliverable, and do not need to be considered here.
+</p>
 
 <blockquote>
 
 <table border="1">
 
-<tr><th align="left">Destination domain list </th> <th
-align="left">Default delivery method </th> <th>Availability
-</th> </tr>
+<tr> <th align="left">Domain class</th> <th align="left">Recipient
+domain match </th> <th> Delivery method </th> <th>Availability </th>
+</tr>
 
-<tr><td>$<a href="postconf.5.html#mydestination">mydestination</a>, $<a href="postconf.5.html#inet_interfaces">inet_interfaces</a>, $<a href="postconf.5.html#proxy_interfaces">proxy_interfaces</a> </td>
-<td>$<a href="postconf.5.html#local_transport">local_transport</a> </td> <td>Postfix 1.0</td></tr>
+<tr><td>Local</td> <td><a href="postconf.5.html#mydestination">mydestination</a>, <a href="postconf.5.html#inet_interfaces">inet_interfaces</a>, <a href="postconf.5.html#proxy_interfaces">proxy_interfaces</a>
+</td> <td><a href="postconf.5.html#local_transport">local_transport</a> </td> <td>Postfix 1.0</td></tr>
 
-<tr><td>$<a href="postconf.5.html#virtual_mailbox_domains">virtual_mailbox_domains</a> </td> <td>$<a href="postconf.5.html#virtual_transport">virtual_transport</a> </td>
-<td>Postfix 2.0</td> </tr>
+<tr><td>Virtual mailbox</td> <td><a href="postconf.5.html#virtual_mailbox_domains">virtual_mailbox_domains</a> </td>
+<td><a href="postconf.5.html#virtual_transport">virtual_transport</a> </td> <td>Postfix 2.0</td> </tr>
 
-<tr><td>$<a href="postconf.5.html#relay_domains">relay_domains</a> </td> <td>$<a href="postconf.5.html#relay_transport">relay_transport</a> </td> <td>Postfix
-2.0</td> </tr>
+<tr><td>Relay</td> <td><a href="postconf.5.html#relay_domains">relay_domains</a> </td> <td><a href="postconf.5.html#relay_transport">relay_transport</a>
+</td> <td>Postfix 2.0</td> </tr>
 
-<tr><td>none </td> <td>$<a href="postconf.5.html#default_transport">default_transport</a> </td> <td>Postfix 1.0</td>
-</tr>
+<tr><td>Default</td><td> none </td> <td><a href="postconf.5.html#default_transport">default_transport</a> </td>
+<td>Postfix 1.0</td> </tr>
 
 </table>
 
 </blockquote>
 
-<h3> <a name="transport"> Mail transport switch </a> </h3>
+<p> The delivery methods in the above table may include a next-hop
+destination in addition to a delivery transport. This may override
+the next-hop destination that is by default taken from the recipient
+domain. </p>
 
-<p> Once the <a href="trivial-rewrite.8.html">trivial-rewrite(8)</a> daemon has determined a default
-delivery method it searches the optional <a href="transport.5.html">transport(5)</a> table for
-information that overrides the message destination and/or delivery
-method.  Typical use of the <a href="transport.5.html">transport(5)</a> table is to send mail to
-a system
-that is not connected to the Internet, or to use a special SMTP
-client configuration for destinations that have special requirements.
-See, for example, the <a href="STANDARD_CONFIGURATION_README.html">STANDARD_CONFIGURATION_README</a> and <a href="UUCP_README.html">UUCP_README</a>
-documents, and the examples in the <a href="transport.5.html">transport(5)</a> manual page.  </p>
+<p> Over time, features have been added to override the above
+transport and/or next-hop destination information. The following
+table lists where a transport or next-hop destination may be taken
+from, depending on the recipient domain class. </p>
 
-<p> Transport table lookups are disabled by default. To enable,
-edit the <a href="postconf.5.html#transport_maps">transport_maps</a> parameter in the <a href="postconf.5.html">main.cf</a> file and specify
-one or more lookup tables, separated by whitespace or commas. </p>
+<blockquote>
 
-<p> Example: </p>
+<table border="1">
+
+<tr> <th>Domain class</th> <th>Transport sources (in order of
+descending precedence)</th> <th> Next hop sources (in order of
+descending precedence)</th> </tr>
+
+<tr> <td> Local </td> <td> <a href="postconf.5.html#transport_maps">transport_maps</a>, <a href="postconf.5.html#local_transport">local_transport</a></td>
+<td> <a href="postconf.5.html#transport_maps">transport_maps</a>, <a href="postconf.5.html#local_transport">local_transport</a>, recipient domain</td> </tr>
+
+<tr> <td> Virtual mailbox </td> <td> <a href="postconf.5.html#transport_maps">transport_maps</a>,
+<a href="postconf.5.html#virtual_transport">virtual_transport</a></td> <td> <a href="postconf.5.html#transport_maps">transport_maps</a>, <a href="postconf.5.html#virtual_transport">virtual_transport</a>,
+recipient domain</td> </tr>
+
+<tr> <td> Relay </td> <td> <a href="postconf.5.html#transport_maps">transport_maps</a>, <a href="postconf.5.html#relay_transport">relay_transport</a></td>
+<td> <a href="postconf.5.html#transport_maps">transport_maps</a>, <a href="postconf.5.html#relay_transport">relay_transport</a>, <a href="postconf.5.html#sender_dependent_relayhost_maps">sender_dependent_relayhost_maps</a>,
+<a href="postconf.5.html#relayhost">relayhost</a>, recipient domain</td> </tr>
+
+<tr> <td> Default </td> <td> <a href="postconf.5.html#transport_maps">transport_maps</a>,
+<a href="postconf.5.html#sender_dependent_default_transport_maps">sender_dependent_default_transport_maps</a>, <a href="postconf.5.html#default_transport">default_transport</a></td>
+<td> <a href="postconf.5.html#transport_maps">transport_maps</a>, <a href="postconf.5.html#sender_dependent_default_transport_maps">sender_dependent_default_transport_maps</a>,
+<a href="postconf.5.html#default_transport">default_transport</a>, <a href="postconf.5.html#sender_dependent_relayhost_maps">sender_dependent_relayhost_maps</a>, <a href="postconf.5.html#relayhost">relayhost</a>,
+recipient domain</td> </tr>
+
+</table>
 
-<blockquote>
-<pre>
-/etc/postfix/<a href="postconf.5.html">main.cf</a>:
-    <a href="postconf.5.html#transport_maps">transport_maps</a> = <a href="DATABASE_README.html#types">hash</a>:/etc/postfix/transport
-</pre>
 </blockquote>
 
 <h3> <a name="relocated"> Relocated users table </a> </h3>
@@ -1019,6 +1061,11 @@ direct mail for standard aliases such as postmaster to real people.
 The table can also be used to map "Firstname.Lastname" addresses
 to login names. </p>
 
+<p> Note: <a href="ADDRESS_REWRITING_README.html#aliases">local aliasing</a> (<a href="postconf.5.html#alias_maps">alias_maps</a>) applies only to <a href="local.8.html">local(8)</a>
+recipients. This is  unlike <a href="ADDRESS_REWRITING_README.html#virtual">virtual aliasing</a> (<a href="postconf.5.html#virtual_alias_maps">virtual_alias_maps</a>)
+which applies to all recipients: <a href="local.8.html">local(8)</a>, virtual, and remote.
+</p>
+
 <p> Alias lookups are enabled by default. The default configuration
 depends on the operating system environment, but it is typically
 one of the following: </p>