VPOPMAIL'S "IP ALIAS" DOMAINS-----------------------------When performing an auth in vpopmail, you would generally use the full emailaddress as the usernameIf many of your users are from a single domain, then you can optionally putthat domain into the ~vpopmail/etc/defaultdomain file. Then if a user doesntinclude a domain when they auth, the auth will be automatically performed against the domain nominated in the defaultdomain file.This system works well as most mail servers only need to have one domainnominated as a default. However what would happen if you later inheritanother large domain full of users who have their email clients setupto login with just a username only? A vpopmail server can have only onedefault domain. It is going to be a lot of work to have to go to each email client and change it over to login with full email address.vpopmail provides a solution for this scenario : IP Alias Domains.To use IP Alias Domains, you need to bind some more IP addresses to yourmail server. Then use the vipmap program to associate a particular domain to a particular IP address. Then when the auth request arrives, if it does not contain a domain,vpopmail will attach the matching domain from the IP alias table.---Contributed by Michael Bowe 7th Dec 2003