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Top Forums UNIX for Advanced & Expert Users Home email server setup - stuck Post 302848665 by bakunin on Thursday 29th of August 2013 05:18:58 PM
Old 08-29-2013
Quote:
Originally Posted by jalisco
As to the second question. I don't really know how it's set up. MTA = mail transfer agent? I thought that's what Postfix was? The server is not setup as a domain, e. g. the hostname is not the domain name.
Yes, postfix is one MTA (sendmail would be another, etc.). If you send mail your client sends it to your own MTA. This picks it up and transfers it to another MTA, this one maybe to yet another one, etc., finally the last MTA stores it and - upon request of the client of the recipient - sends it to the recipients client. Now, the next to last MTA in this chain has to know somehow that it has to transfer the mail to the last MTA for this to work. Therefore you have to make your system with postfix installed known to the MTA of your ISP (or whoever runs the next-to-last MTA, from which you get your mails) so that your MTA is being delivered the mails adressed to you(r domain).

Quote:
Originally Posted by jalisco
I have not setup a dns server, would that help? If so, I can try it. I didn't know if I needed to set that up as well.
Usually it works like this: you run "your.domain.com" and you have many systems in it. Your users have mail adresses "user@your.domain.com", but in fact they sit on "system1.your.domain.com", "system2.your.domain.com", etc.. This is done by setting up an MTA system like you did, say "mta.your.system.com" and then create a MX record, which states "mta.your.system.com" to be the mail exchange of "your.domain.com" and defining the all users there somehow (typically something like LDAP is used for this).

If you want to set up your own domain you would need a (at least one) static IP address first and then still would have to make your domain known. This means getting your (primary) DNS server (the one responsible for your domain) to be recognized at the ISPs DNS. They would probably hold "domain.com" and would now "delegate" the responsibility for "your.domain.com" to you.

I know, this all doesn't help you immediately, but i thought it would be a good idea to show the general ideas and concepts behind the mail (and DNS) system.

I hope this helps.

bakunin
 

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postfix-nochroot(8)					      System Manager's Manual					       postfix-nochroot(8)

NAME
postfix-nochroot - change /etc/postfix/master.cf to not use chroot SYNOPSIS
postfix-nochroot DESCRIPTION
Renames /etc/postfix/master.cf to /etc/postfix/master.cf.bak and creates a new /etc/postfix/master.cf file with every service configured to not use chroot. Every modified line is commented. It also restarts Postfix (to apply the change) and rmoves the unused chroot directories /var/spool/postfix/{etc,lib,usr} . Using a chroot environment makes upgrades more difficult and gets in the way when running SE Linux (without actually providing any security benefit in a SE Linux system). SEE ALSO
selinux(8), sestatus(8), selinuxenabled(1), check-selinux-installation(8), selinux-config-enforcing(8), selinux-policy-upgrade(8), http://wiki.debian.org/SELinux - More about SELinux Debian install, http://etbe.coker.com.au/tag/selinux/ - Russell's SE Linux blog posts, http://etbe.coker.com.au/2008/08/02/postfix-and-chroot/ - post about this script. AUTHOR
This program and it's man page was written by Russell Coker <russell@coker.com.au> for the Debian system (but may be used by others). Per- mission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 3. On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL-3. postfix-nochroot(8)
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