Some domains cant send us email 2

[pungohboy]

I am having a problem receiving email from certain domains. Here is one of the failure messages that were forwarded to me from the senders personal email address.

The following recipient(s) could not be reached:

user@mydomain.org <<mailto:user@mydomain.org>> on 3/10/2006 4:11 PM
The e-mail system was unable to deliver the message, but did not report a specific reason. Check the address and try again. If it still fails, contact your system administrator.
< mail.sender.com #4.0.0 X-Spam-Firewall; connect to mail.mydomain.org[xxx.xx.xxx.xx]: server refused mail service>


I am trying to figure out which side the problem is on and why it is happening. Any help is very much appreciated

 

[pungohboy]

We have reason to believe it is on the senders end because it is not hitting our mail gateway at all but we need to verify that.

 

[markdmac]

Actually you really still don't know.

< mail.sender.com #4.0.0 X-Spam-Firewall; connect to mail.mydomain.org[xxx.xx.xxx.xx]: server refused mail service>

Your server is refusing to allow their server to send mail. The question is WHY?

Need to know the real domain names to be able to query public DNS for you to help look up what may be causing the problem. most likely they do not have an RDNS entry.

I hope you find this post helpful.

Regards,

Mark

 

[pungohboy]

Thanks for the info Mark

gwfh.com is the sender and albemarlemhc.org is the recipient.

 

[markdmac]

gwfh.com's MX points to 204.120.3.20 and does resolve back ok on a RDNS lookup.

So, I would check on your server and see what restrictions you have in place and make sure that the above IP is not being denied access to your SMTP.

Also, does the error mail.mydomain.org[xxx.xx.xxx.xx]: actually show your correct public IP?

I hope you find this post helpful.

Regards,

Mark

 

[markdmac]

I do see that YOUR IP 208.11.174.66 does NOT resolve back to your domain. SO it is possible that they have some kind of validation going on to prevent sending to you if you don't resolve back properly, but that is just conjecture. As is you should be getting mail failures when trying to deliver to major carriers such as Yahoo, Hotmail, AOL, MSN, Optonline and an ever growing list. You need to have this fixed ASAP.

I hope you find this post helpful.

Regards,

Mark

 

[pungohboy]

Thank you for the info. I am testing email between our domain and my yahoo account right now. How do you go about setting the DNS PTR record?

 

[markdmac]

Depends on your ISP. Some require you to call them, others make it available within a web page to manage your DNS. Whoever assigns your public IP is who you need to talk to.

I hope you find this post helpful.

Regards,

Mark

 

[pungohboy]

Thank you we are now working with our ISP on this issue.

 

[nickpark]

...or could it be YOUR spam firewall blocking the connection...?

 

[markdmac]

Yes we still don't know about that yet, only that pungohboy's domain lacks the RDNS which will cause him delivery problems.

I hope you find this post helpful.

Regards,

Mark

 

[pungohboy]

Actually the spam firewall we have is a mail gateway and the messages never even hit that. We are still trying to get the RDNS issue straight with our ISP. I will update when we find something out. Also today one of our users sent an email to an aol account and it got bounced back saying we were spammers which points to the RDNS issue.