These programs are used to deliver mail and manage accounts for vm-pop3d
virtual domains.

Post acts like mail.local for virtual users.
vpasswd manages passwords
valias manages aliases
vpoppasswd is a password changing service.

vm-pop3d puts mail into virtual mailboxes (on my system, they are
put into /var/spool/virtual/<domain>/<user>) and it uses virtual
password files (on my system, /usr/local/etc/virtual/<domain>/passwd)
for the users.   I've expanded on this a little bit by adding alias
files (/usr/local/etc/virtual/<domain>/alias) that create aliases for
local mailboxes, and by adding a master domain configuration file
that maps between Unix logins and virtual domains, so that the owner
of a domain can manage the mail accounts for that domain by themself.

If you use post to deliver mail through sendmail, there are a couple
of really nasty gotchas that I've discovered.

First, you need to put the domain into mailertable as
	domain	post:domain
	.domain	post:domain

and then you need to make sure that the domain has an
IN A dns record.  If it doesn't, but simply has an mx,
sendmail will cheerfully rewrite the domain to the domain
of the mx and will thus misdeliver mail until the cows
come home.


