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:
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