MAKEHOSTEDDOMAINS(8)					      Double Precision, Inc.					      MAKEHOSTEDDOMAINS(8)

NAME

       makehosteddomains - Build a database of hosted domains

SYNOPSIS

       makehosteddomains

DESCRIPTION

       makehosteddomains rebuilds the contents of the /etc/courier/hosteddomains.dat database from the contents of /etc/courier/hosteddomains.
       This can be either a file or a directory. If it's a directory, the contents of all the files in this directory are simply concatenated. The
       makehosteddomains script must be run in order for any changes to /etc/courier/hosteddomains to take effect.

       The function of /etc/courier/hosteddomains is very similar to the one of /etc/courier/locals. Both configuration files specify a list of
       domains that are considered to be local domains - domains whose mailboxes are stored locally.

       The difference is that domains listed in /etc/courier/locals are removed from addresses before their mailbox is looked up. For example, if
       the domain "example.com" is listed in /etc/courier/locals, then the address <user@example.com> is delivered to a local mailbox named
       "user". If this domain is listed, instead, in /etc/courier/hosteddomains, then the address <user@example.com> is delivered to a local
       mailbox named "user@example.com". Usually you would use /etc/courier/locals to specify domains that correspond to your local system
       accounts, that are looked up in your system's password database. The /etc/courier/hosteddomains file is usually used when you have
       database-based virtual domains, that are maintained via an LDAP or a MySQL server. The Courier mail server's LDAP and MySQL authentication
       modules will use the full E-mail address to query the LDAP or MySQL server for the location of the local mailbox that correspond to the
       E-mail address. The Courier mail server's authuserdb authentication module can also use full E-mail addresses.

   Contents of hosteddomains
       The file /etc/courier/hosteddomains simply contains a list of domains, one per line, for example:

	   domain.com
	   example.org

       Each domain can optionally be followed by a single tab character, in order to specify an alias for a domain, for example:

	   domain.com
	   mail.domain.com<TAB>domain.com
	   example.com<TAB>domain.com

       First, we list the domain "domain.com" as a hosted domain. Then, we also list the domain "mail.domain.com", which is an alias for
       domain.com. The Courier mail server will take any address of the form <address@mail.domain.com>, rewrite it as <address@domain.com>, and
       attempt to deliver the mail to a local mailbox for that name. The third entry does the same for "example.com"; mail addressed to
       <address@example.com> is delivered to the local mailbox <address@domain.com>.

   alias@hosteddomain
       This is a special local mail delivery rule for hosteddomain-listed domains. This rule allows the Courier mail server accept mail to any
       address@hosteddomain, where "hosteddomain" is a domain listed in the hosteddomains file, but there is no corresponding account for
       address@hosteddomain. To provide delivery instructions for any non-existing address in a hosteddomain-listed domain:

       1) Create the local address alias@hosteddomain. For example, if the hosteddomains file contains "example.com", create the local account
       alias@example.com. This should be a normal account, with its own home directory, userid and groupid.

       2) Create $HOME/.courier-default file in this account, containing the delivery instructions. See the dot-courier(5)[1] manual page for
       available delivery instructions.

       NOTE that alias@example.com must be a real account, not a mail alias. If you want to forward alias@example.com to another address, put
       forwarding instructions in the .courier-default file. However, alias@example.com can be a clone of another account (with the same home
       directory, userid, and groupid).

   "WILDCARD DNS"
       Wildcard DNS is supported for hosteddomains by placing a single period character before the domain name. For example, the hosted domain
       entry ".domain.com" will cause the Courier mail server to accept mail for "anything.domain.com".

       The Courier mail server will accept mail for <address@any.thing.domain.com> and attempt to deliver it to the local mailbox
       <address@any.thing.domain.com>, and if that fails then attempt to deliver the mail to the local mailbox <address@.thing.domain.com>, then
       finally <address@.domain.com>

	   Note
	   There is a period after the '@' character. If you want all mail for "any.thing.domain.com" to be delivered as though it were sent to
	   "domain.com", you should define an alias for the domain, for example:

	       domain.com
	       .domain.com<TAB>domain.com

SEE ALSO

       esmtpd(8)[2].

AUTHOR

       Sam Varshavchik
	   Author

NOTES

	1. dot-courier(5)
	   [set $man.base.url.for.relative.links]/dot-courier.html

	2. esmtpd(8)
	   [set $man.base.url.for.relative.links]/esmtpd.html

Courier Mail Server						    08/30/2011						      MAKEHOSTEDDOMAINS(8)