By default, all popstore accounts for a given installation share the
same name space. This means that if the two distinct e-mail addresses
sue@acme.com and sue@frob.org are directed to the same popstore, then
e-mail to either of these addresses will be delivered to the same user
account sue. At some sites, however, it is useful to have
distinct communities of users, each with their own name spaces. This is
achieved with the popstore² through the use of "user
domains". Please see Section 1.3.5 for a basic discussion of
popstore user domains. This section focuses on the mechanics of
creating and managing user domains and assumes knowledge of the
material presented in Section 1.3.5 .
Note that all e-mail messages for all user domains are co-mingled in the same directory tree. That is, messages for one user domain are not stored distinct from other user domains.
6.13.1 Enabling user domains
To enable the use of user domains, specify USE_DOMAINS=1 in the
popstore option file. See Section 3.4 for further details
including an important note for sites who are already associating
more than one Internet host name with the popstore.
Note:
You must not use thefilterchannel keyword on the popstore or MessageStore delivery channel if USE_DOMAINS=1 is set. So doing will cause the wrong filters to be used for users in domains other than thedefaultdomain.