Cannot send email to certain email addresses...

[jasonaedwards]

Hello,

I am having a strange problem. None of our users can send email to certain domains using Exchange 2000, but using hotmail or other POP3 mail works. I can even remotely connect to port 25 via telnet to the remote server in question, from the Exchange server, and manually create an email. This works fine. I have enabled logging on the SMTP service, and have noticed that Exchange can connect to these remote servers. Once connected, it:

Issues a EHLO command.
Receives a valid response.
Then it issues a QUIT command.
Connection is terminated.

On most servers, where email is being sent properly, it:

Issues a EHLO command.
Receives a valid response.
Issues a MAIL FROM command.
Receives a valid response.
Issues a RCPT To command.
Receives a valid reponse.
Issues a DATA command. Sends the contents of the email.
Then it issues a QUIT command.

Does anyone have ANY idea why it is doing this? Considering I can connect manually via telnet on port 25 from the Exchange Server itself and send the email, I cannot see why Exchange would also not be able to send the email.

Thanks

Jason

 

[peterpark]

One possibility is incorrect DNS settings either at your end or the other mail domain. Go to

http://www.dnsreport.com

and check for any errors for your domain or the receiving domain.

 

[JohnB03]

One thought is that these destination domains may subscribe to blacklist services and for some reason you are blacklisted. To find out if you are go to the following link. Hope this helps.

http://ordb.org/

 

[robprince]

One thing to check also is, TimeWarner (Road Runner or Bright House) is blocking alot of e-mail traffic these days from anyone who is using broadband connections.

http://security.rr.com

They have a way to fix it if you qualify....under there standards......

Robert