Open relay check and email delivery issue.

kozdo
kozdo used Ask the Experts™
on
Hi,

We run a webhosting server - WHM, Cpanel but some other servers don`t accept emails form our server. We are not blacklisted and the reverse DNS is ok. But we may have an open relay. But we`re not sure.
1. How can we check it to be sure and how can we manage to NOT to have an open relay?
2. What other factors can cause that email from our mail server are not delivered to some destinations?
3. What can we do to have it in 100% state that it will always work well and every email will be delivered.

Thank you very much for help. Our server Ip is 77.240.176.70.
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Hello,

You can use this tool to check if you are an open relay - http://www.checkor.com/

JJ
You don't appear to be an open relay. Are you getting an NDR from the domains you can't send to?

JJ

Author

Commented:
hi,

no i;m not getting anything, when i send email, it just disappears. And Yahoo places all emails from our server to the spam folder.
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Author

Commented:
Maybe we still miss something in configuration in WHM.
I'm not familiar with WHM. Are there any logs that you can track email to see if it actually left your server? Since you aren't receiving any NDRs and your mail is ending up in the spam folder in Yahoo! mailboxes, I suspect your mail is getting caught up in spam filters.

You can try this as a test - from your mail server, initiate a telnet session to the mail server of one of the recipients who is not receiving email from you. Send mail through the telnet session. It will tell you id the recipient's server accepted the message or you may get an error message. If the message is accespted, verify the recipient received it. If they did not, the message is being filtered at the recipient's end.

http://www.yuki-onna.co.uk/email/smtp.html

JJ

Author

Commented:
Yes, it is being filtered at the recipient's end. But we don;t know why and how can we prevent this?
You should change the hostname specified on your SMTP server. When I telnet to your server, it responds with ntbox-01.netax.cz instead of mail.ntbox.cz. This creates problems with reverse lookups.

To know for sure why your mail is being filtered at the reciepient's end, you would need to ask them. There could be specific content or keywords in your messages that are causing them to be identified as spam. Do you add a common disclaimer to all your outbound email? If so, you could try removing it.

JJ

Author

Commented:
ah, ok, thank you.

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