03-25-2013
If you're using ubuntu, you are in luck. The ubuntu community documentation explains about setting up a mail server. It's not that easy. I set up a mail server, but every time I go back to change something it is somewhat confusing. I would document whatever you do in some personal readme files.
You normally need a static ip. But it may also work with DynDNS or similar service. I'm not sure. I use a static IP for a mail server I have at an ISP, but use the DynDNS to remotely connect to a windows PC where the IP address changes now and then.
https://help.ubuntu.com/community/MailServer you may have already seen. If not, start there.
I kind of doubt there is a language for tweaking the webmail interface. More likely some options you select. But the only way to know is to try it. Have a good time. I think it's a good project, lots of interesting details.
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LEARN ABOUT OSX
makepercentrelay
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)