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-rw-r--r--README_FILES/ADDRESS_CLASS_README76
1 files changed, 42 insertions, 34 deletions
diff --git a/README_FILES/ADDRESS_CLASS_README b/README_FILES/ADDRESS_CLASS_README
index 7605aa2..774976e 100644
--- a/README_FILES/ADDRESS_CLASS_README
+++ b/README_FILES/ADDRESS_CLASS_README
@@ -25,18 +25,23 @@ important for the operation of Postfix.
An address class is defined by three items.
- * The list of domains that are a member of that address class: for example,
- all local domains, or all relay domains.
+ * The list of domains that are a member of that address class.
- * The default delivery transport for that address class. For example, the
- local, virtual or relay delivery transport (delivery transports are defined
- in master.cf). This helps to keep Postfix configurations simple, by
- avoiding the need for explicit routing information in transport maps.
+ Examples: all local domains, or all relay domains.
- * The list of valid recipient addresses for that address class. The Postfix
- SMTP server rejects invalid recipients with "User unknown in <name of
- address class here> table". This helps to keep the Postfix queue free of
- undeliverable MAILER-DAEMON messages.
+ * The default delivery transport for domains in that address class.
+
+ Examples: local_transport or relay_transport (these point to services
+ defined in master.cf).
+
+ Benefit: this avoids the need for explicit routing information in transport
+ maps.
+
+ * The list of valid recipient addresses for that address class.
+
+ Benefit: the Postfix SMTP server rejects an invalid recipient with "User
+ unknown in <name of address class> table", and avoids sending a MAILER-
+ DAEMON message with backscatter spam.
WWhhaatt aaddddrreessss ccllaasssseess ddooeess PPoossttffiixx iimmpplleemmeenntt??
@@ -56,11 +61,11 @@ The local domain class.
also includes mail for user@[ipaddress] when the IP address is listed with
the inet_interfaces or proxy_interfaces parameters.
- * Valid recipient addresses are listed with the local_recipient_maps
- parameter, as described in LOCAL_RECIPIENT_README. The Postfix SMTP server
- rejects invalid recipients with "User unknown in local recipient table". If
- the local_recipient_maps parameter value is empty, then the Postfix SMTP
- server accepts any address in the local domain class.
+ * Valid recipient addresses for those domains are listed with the
+ local_recipient_maps parameter, as described in LOCAL_RECIPIENT_README. The
+ Postfix SMTP server rejects invalid recipients with "User unknown in local
+ recipient table". If the local_recipient_maps parameter value is empty,
+ then the Postfix SMTP server accepts any address in the local domain class.
* The mail delivery transport is specified with the local_transport
parameter. The default value is llooccaall::$$mmyyhhoossttnnaammee for delivery with the
@@ -69,20 +74,23 @@ The local domain class.
The virtual alias domain class.
* Purpose: hosted domains where each recipient address is aliased to an
- address in a different domain, for example, a local UNIX system account or
- a remote address. A virtual alias example is given in the VIRTUAL_README
- file.
+ address in a different domain class, for example, a local UNIX system
+ account or a remote address. A virtual alias example is given in the
+ VIRTUAL_README file.
* Domain names are listed in virtual_alias_domains. The default value is
$virtual_alias_maps for Postfix 1.1 compatibility.
- * Valid recipient addresses are listed with the virtual_alias_maps parameter.
- The Postfix SMTP server rejects invalid recipients with "User unknown in
- virtual alias table". The default value is $virtual_maps for Postfix 1.1
- compatibility.
+ * Valid recipient addresses for those domains are listed with the
+ virtual_alias_maps parameter. The Postfix SMTP server rejects invalid
+ recipients with "User unknown in virtual alias table". The default value is
+ $virtual_maps for Postfix 1.1 compatibility.
+
+ Note: for historical reasons, virtual_alias_maps apply to recipients in
+ all domain classes, not only the virtual alias domain class.
- * There is no mail delivery transport parameter. Every address must be
- aliased to an address in some other domain.
+ * There is no configurable mail delivery transport. Every address must be
+ aliased to an address in some other domain class.
The virtual mailbox domain class.
@@ -93,11 +101,11 @@ The virtual mailbox domain class.
* Domain names are listed with the virtual_mailbox_domains parameter. The
default value is $virtual_mailbox_maps for Postfix 1.1 compatibility.
- * Valid recipient addresses are listed with the virtual_mailbox_maps
- parameter. The Postfix SMTP server rejects invalid recipients with "User
- unknown in virtual mailbox table". If this parameter value is empty, the
- Postfix SMTP server accepts all recipients for domains listed in
- $virtual_mailbox_domains.
+ * Valid recipient addresses for those domains are listed with the
+ virtual_mailbox_maps parameter. The Postfix SMTP server rejects invalid
+ recipients with "User unknown in virtual mailbox table". If this parameter
+ value is empty, the Postfix SMTP server accepts all recipients for domains
+ listed in $virtual_mailbox_domains.
* The mail delivery transport is specified with the virtual_transport
parameter. The default value is vviirrttuuaall for delivery with the virtual(8)
@@ -113,11 +121,11 @@ The relay domain class.
* Domain names are listed with the relay_domains parameter.
- * Valid recipient addresses are listed with the relay_recipient_maps
- parameter. The Postfix SMTP server rejects invalid recipients with "User
- unknown in relay recipient table". If this parameter value is empty, the
- Postfix SMTP server accepts all recipients for domains listed with the
- relay_domains parameter.
+ * Valid recipient addresses for those domains are listed with the
+ relay_recipient_maps parameter. The Postfix SMTP server rejects invalid
+ recipients with "User unknown in relay recipient table". If this parameter
+ value is empty, the Postfix SMTP server accepts all recipients for domains
+ listed with the relay_domains parameter.
* The mail delivery transport is specified with the relay_transport
parameter. The default value is rreellaayy which is a clone of the smtp(8)