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)
           http://www.courier-mta.org/dot-courier.html

        2. esmtpd(8)
           http://www.courier-mta.org/esmtpd.html