Hi,

I've a domain foobar.com and I'm "out-sourcing" the email of this account to Google Apps for your Domain. Meaning that the MX records of foobar.com point to Google. user1@foobar.com, user2@foobar.com,... all login to google apps to view and manage their mail.

I've a linode with Ubuntu 8.04 and after install the hostname was "ubuntu" and the beginning of /etc/hosts file was:

127.0.0.1       localhost
127.0.1.1       ubuntu  ubuntu.linlan

Then I installed Postfix and in the Postfix configuration I set node-n.foobar.com as my destination (because I want my linde to be called node-n). I didn't changed hostname.

Then I tested the instalation with the command sendmail. It sent OK and I checked the header of the sent message:

Received: from ubuntu.linlan (xxxxxx.members.linode.com [xxx.xxx.xxx.xxx])
        by mx.google.com with ESMTP id 6si13606729ywp.3.2008.05.05.10.07.59;
        Mon, 05 May 2008 10:08:11 -0700 (PDT)

I disliked the "Received: from ubuntu.linlan" because I want it to be node-n or node-n.foobar.com.

So I edited /etc/hostname changing it to node-n and /etc/host changing it to:

127.0.0.1       localhost
127.0.1.1       node-n  node-n

The problem is... the header keeps ubuntu.linlan as hostname/localdomain. Can I get ride of that?

Thanks for your help.

Postfix will need to be restarted after changing the host name for it to see the new name.

Mike

Ubuntu puts the hostname used by Postfix in /etc/mailname, IIRC.

You can see what postfix thinks it is with "postconf myhostname" and "postconf myorigin". (I don't have the standard Ubuntu postfix setup on even my Ubuntu machines so I can't remember which of those two points to the other.)

Hi Mike, thanks for your attention but it didn't work!

First I change my /etc/hosts to

127.0.0.1     localhost
127.0.0.1     node-n node-n.foobar.com

Then I issued:

sudo /etc/init.d/postfix reload
sudo /etc/init.d/postfix restart

But no success! The Received: from ubuntu.linlan keeps appearing! I even tried to reboot my server... no luck.

Perhaps this is a setting from Linode and has nothing to do with my machine.

/etc/mailname

Yes Mendel... it worked!! Thanks!

I issued "postconf" myhostname and it returned "ubuntu.linlan"... so something was wrong.

Then I edited /etc/postfix/main.cf, the variable myhostname was there. I replaced "ubuntu.linlan" by "node-n.foobar.com", and I restarted postfix.

Now it works like a charm!

/etc/mailname was right. The problem was in /etc/postfix/main.cf because I installed Postfix prior to the hostname/hosts change and the variable is not redefined.

I love UNIX but sometimes... ggg!

Well, this time you can blame Debian specifically. Postfix as distributed defaults to the machine's hostname for myhostname and myorigin.