postfix local users/domains

English Network/Internet
1

Hi all,
I’m new to opensuse and linux in general. I’m trying setup home mailing server. I have real domain xyz.dyndns.org, but for now I just want mail to use inside intranet. I tried to config postfix as a mail sender for system users. So I have:
myhostname = linux.xyz.dyndns.org
mydomain = xyz.dyndns.org
mydestination = localhost.$mydomain, $mydomain, localhost
mynetworks = 192.168.1.0/24, 127.0.0.0/8

I want to be able to send email to user@xyz.dyndns.org and to be treated like local system address, not to go out and back in - so without need forward ports to the server. I’m not running dns.

Note I’m able to send/receive user@localhost but not user@xyz.dyndns.org and I want this email to be treated the same.

What should be the best way to achieve this - is virtual domain needed?

Thanks,
Milan

2

To be able to do this, you need to resolve those domains to local IPs. This means setting up your own DNS server to resolve xyz.dyndns.org only within your LAN.

3

Actually I already had similar setup but on win and free mail server so I wanted to keep the same addresses. I’m thinking about editing /etc/hosts to add record to resolve xyz.dyndns.org to my local 192.168.1. address…or maybe there are other suggestions?

4

You would have to edit it on all the machines then.

5

Well it doesn’t work even on the same machine where I’m running mail server. I added:
127.0.0.1 xyz.dyndns.org

(Of course it’s not really xyz:))

whan I ping xyz.dyndns.org I get replay from 127.0.0.1 but still when I’m sending mail I get error from log:
linux postfix/error[16939]: D9E8E7AF5E: to=<user@xyz.dyndns.org>, relay=none, delay=0.12, delays=0.06/0.01/0/0.05, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to xyz.dyndns.org[92.60.xx.yy]:25: Connection refused)

(domains and ips altered here).

I’m doing all this on the same machine…seems like postfix ignores somehow /etc/hosts…I’m confused :frowning:

6

You probably already have a line with 127.0.0.1, so you have to add it as an alias on that line:

127.0.0.1 localhost … xyz.dyndns.org

7

Yes, I did that as well but it doesn’t work :frowning:
When I ping domain I get answer from local ip, but postfix still tries to send to public ip.

Thanks for the quick answers.

8

In that case postfix is not using /etc/hosts as a resolution source. All in all I would recommend DNS since you can apply it to all machines on your LAN.

9

Just to inform you that I solved the problem. Actually it was trivial - there were settings the bottom of the main.cf auto-generated which were overwriting my settings. Actually top of the file has warning about this :frowning:

Thanks