I am using a dyndns for that server and it works fine. When i go to send a email out from my server it response that its spam from the receaving server and doesnt send the email to the receaving server. the strange things that it work from the main account to gmail but when i send via another account it rejects the email. i can receive email just fine,but sending it not find. I would like to know how i can resolve this issue?

Thank you
Shane

Post edited by: asparatu, at: 2008/10/07 17:12

DNS is to blame. DNS is always to blame.

Be sure you have working reverse resolution for your IP address. Your host probably provides it...but make sure. The name it returns doesn't matter, as long as it returns something that also forward resolves.

e.g.:

[root@www ~]# host 70.86.4.238
238.4.86.70.in-addr.arpa domain name pointer ee.4.5646.static.theplanet.com.
[root@www ~]# host ee.4.5646.static.theplanet.com.
ee.4.5646.static.theplanet.com has address 70.86.4.238

If so, check to be sure the name that Postfix is sending in it's HELO/EHLO connection buildup is sane...something that resolves. Usually the headers in the bounced message will tell you this information.

SPF. Are you using it? Is it pointing to the right address?

Is your server in any DNS blacklists? Use any of the many RBL lookup tools out there to see if your IP has been blacklisted--either for being an open relay (in the past, or present), for being in a dynamic home use block, or for past spam behavior from your IP (you never know who might have had your IP before you).

Oh, wait. You just said you're using DynDNS. That'll be the problem. Dynamic IP ranges are pretty much universally considered a spammy trait. You can't run a reliable mail server from a dynamic IP. You'll need to forward through your ISPs mail server, or some other mail server that is on a dedicated IP.

ok.. thank you for your help.. so in order for me to send email i would have to register a domain. Another question i have.. can not just make my own domain on the server? but how would i the root servers to see it?

shane

so in order for me to send email i would have to register a domain.

Where did you get that idea? I said, "Dynamic IP ranges are pretty much universally considered a spammy trait. You can't run a reliable mail server from a dynamic IP." I didn't say anything about a domain. I'm saying you cannot send mail reliably from a dynamic IP--you need to send it through your ISPs SMTP server (if they offer on), or through a server on a static IP.

The "what domain does the mail come from" and "how do I register and setup a domain" questions are completely unrelated to sending mail from a server on a dynamic IP. ;-)

What I'm saying is: Find out how to send mail through your ISP, and setup the "relayhost" directive in Postfix on your server. Do not try to send mail directly from your server to the world at large. It will either fail to work entirely (if your ISP filters port 25) or it will work very unreliably (because a dynamic IP is extremely spammy).

I am sorry that I didn't explain myself better. I understand what you were saying.

What i wanted to know is, If was to have static IP Address and made a URL on my DNS server would it be seen from the outside world? or would I have to go to like Network Solutions to register it?

shane