Name: virtdomains
Type: ENUM
Allowed-Values: off userid on
Default-Value: off
Last-Modified: 3.1.8

Configure virtual domain support.

*off*
    Cyrus does not know or care about domains. Only the local part of email
    addresses is ever considered.  This is not recommended for any
    deployment, but is currently the default.

*userid*
    The user's domain is determined by splitting a fully qualified userid
    at the last '@' or '%' symbol.  If the userid is unqualified, the
    *defaultdomain* will be used.  This is the recommended configuration
    for all deployments.  If you wish to provide calendaring services you
    must use this configuration.

*on*
    Fully qualified userids are respected, as per "userid".  Unqualified
    userids will have their domain determined by doing a reverse lookup on
    the IP address of the incoming network interface, or if no record is
    found, the *defaultdomain* will be used.
