I am using Zonedit and Linode for a while, and basically my mail and everything resolves and works ok.

www.hiddenworld.net

However, I had trouble getting another mail server to accept my messages. Here is their rejection response in my log (yyy.yyy.. is my ip address):

> host mail.anotherdomain.com[xxx.xxx.xxx.xxx] said: 450
> Client host rejected: cannot find your hostname,
> [yyy.yyy.yyy.yyy] (in reply to RCPT TO command) 

This thread says I need PRT record:

Is that a part of Postfix configuration, or do I need to change something in my Zoneedit record?

I guess the remote host can't resolve my IP to an address? How can I resolve?

As you know, normal DNS takes a hostname and returns an address. There is also RDNS (Reverse DNS) - RDNS takes an IP address and returns a hostname - it uses PTR (PoinTeR records) to do this.

For mail to work you have to set rdns - this is done in the Linode Platform Manager rather than with zoneedit - because you're doing things backwards: associating and IP address (owned by linode) with your domain (owned by you).

Mailservers look up PTR records to stop basic spam techniques - spammers liying about hostnames to try and avoid detection.

Hope this helps,

Dan

Thanks for that! Can you direct me to Linode Platform Manager so that I can make the corrections?

In my "member's home" page, I have already set the reverse DNS, but it sounds like you are refering to something else...

Thanks!
Jeff

Members page is the right place (LPM is just the fancy name...), the change can take about 24 hours though.

Try typing "host <your ip>" at your command prompt to check your RDNS - you'll either see your domain (in which case its done) or a linode domain (in which case the changes haven't propogated yet.

if you don't have host installed, its in the bind9-host package in debian, you can also check them online at http://www.samspade.org/t/

I was just impatient. You were right, after 24 hours looks like my messages are now being delivered!

Thanks!