PMDF System Manager's Guide
3.5 Forwarding Mail
PMDF provides several mechanisms for forwarding mail. The method
appropriate to a task at hand depends upon the scope of the forwarding:
- Forwarding mail for selected users. To forward mail for
selected users, it is best to use aliases. You may also use aliases to
accept mail for a non-existent user and forward it on to one or more
real users. See Section 3.5.1.
- Forwarding mail to a list of users. Aliases are also used
to create mailing lists. See Section 4.1; Section 4.1.3 contains a
mailing list example.
- Forwarding mail for selected users in other than the local
domain. To forward mail for selected users in an arbitrary domain
(a domain other than the local channel name), use of the directory
channel is often appropriate. See Section 3.2.
- Forwarding all mail for a given host to another host. In
this case there are several approaches. The most efficient method
requires that you be able to blindly change
user@new-host without any conflict in
user names; i.e., not have to worry that the username
user" on old-host conflicts with a
different person on
new-host who has the same
username. When this is the case, simple rewrite rules in the PMDF
configuration file may be used. The less efficient, but just as
effective, approaches involve using either a
mapping or directory channel. See Section 3.5.2.