MAKEPERCENTRELAY(8) Double Precision, Inc. MAKEPERCENTRELAY(8)NAME
makepercentrelay - Build a list of %-relayed domains
SYNOPSIS
makepercentrelay
DESCRIPTION
makepercentrelay reads /etc/courier/esmtppercentrelay.dir and creates /etc/courier/esmtppercentrelay.dat which is a binary database file.
The files /etc/courier/esmtppercentrelay and /etc/courier/esmtppercentrelay.dat specify a list of "percent-hack" domains.
/etc/courier/esmtppercentrelay is a plain text file, containing one domain per line. The Courier mail server loads the contents of
/etc/courier/esmtppercentrelay into memory, so if you have a lot of domains, you will want to use the binary database file. The
makepercentrelay command reads /etc/courier/esmtppercentrelay.dir, which can be either a plain text file itself, or a directory containing
plain text files. All files in the subdirectory are concatenated, and the binary database file is created from the result.
the Courier mail server can use both /etc/courier/esmtppercentrelay and /etc/courier/esmtppercentrelay.dat at the same time. Usually you
would put a couple of your most frequent domains in /etc/courier/esmtppercentrelay, then put the rest in
/etc/courier/esmtppercentrelay.dir, and use makepercentrelay to turn it into a database file.
"percent-hack" domains are a list of domains for which the Courier mail server accepts mail via ESMTP addressed as
"local%percent.hack.domain@local.domain", where "percent.hack.domain" is a domain found in /etc/courier/esmtppercentrelay or
/etc/courier/esmtppercentrelay.dat, and "local.domain" is any domain found in /etc/courier/locals. The Courier mail server removes the
local domain, and rewrites the address as "local@percent.hack.domain", then attempts to deliver it.
The percent hack applies only to mail received via ESMTP. The Courier mail server does not check this list of domains if the message is
received via any other way (such as by running /usr/bin/sendmail directly from the command line). "percent.hack.domain" would likely to be
a domain that the Courier mail server knows how to handle via some other means. It might be an entry in /etc/courier/aliases, or an entry
in /etc/courier/esmtproutes.
SEE ALSO esmtpd(8)[1], makealiases(8)[2].
AUTHOR
Sam Varshavchik
Author
NOTES
1. esmtpd(8)
[set $man.base.url.for.relative.links]/esmtpd.html
2. makealiases(8)
[set $man.base.url.for.relative.links]/makealiases.html
Courier Mail Server 08/30/2011 MAKEPERCENTRELAY(8)
Check Out this Related Man Page
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)