Cannot send email to specific address

[HfdWolfPack]

Person sends us an email, we reply with text. Message gets bounced. Other people send this person email without any problem.


The following recipient(s) could not be reached:

' blah blah Construction Blah Blah' on 6/3/03 9:01 AM
Unable to deliver the message due to a communications failure
The MTS-ID of the original message is: c=US;a= ;p=Our Company;l=OurServer-030603125922Z-738

[Siliconjunkie]

Could be that for some reason your domain/network is blacklisted. Or it could be a DNS issue. Is there any more info?

[HfdWolfPack]

How would I know if we were blacklisted?

That is all the info I have. What other info would be helpful?

[Siliconjunkie]

a log of the coversation the 2 servers had would be a huge help. Would let us know if they were talking and what was said.

[HfdWolfPack]

I can trace route the address from the IIS Proxy server, but not from our exchange server.


Edit:

I can ping it from the proxy (IIS), but not the Exchange server. But, the Exchange server does resolve the ip address.

[M_Six]

You can go here and enter your DNS name or IP and see if you're blacklisted.

[HfdWolfPack]

Thanks M_six. New site to me

I contacted them and we are not blacklisted on their servers, but they are checking into it for me.

[HfdWolfPack]

Here is what I was told----


"You would have to add the MX records to your mail server. If we cannot DNS your mail server, you will be unable to send mail to tampabay.rr.com. "

?

[M_Six]

That is to block spam sent from hijacked smtp relay servers. If Joe Schmoe installs IIS on his home box to run a website and sets up smtp with no firewall or smtp relay security, that box can be used to relay spam. Since it's a relay, the From: address will not resolve to the source IP. If you register your MX record so it matches your IP, a reverse DNS lookup will match your user@whatever.com address to the proper IP.

[HfdWolfPack]

When I enter our email server name @ SamSpade it gets resolved to the ip address.