Solved

AN SMTP PROTOCOL ERROR OCCURRED: UNABLE TO SEND MAIL TO CERTAIN DOMAIN

Posted on 2006-06-28
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Last Modified: 2012-05-05
I am not able to mail to xxx@sc.rr.com. I am able to send mail via telnet on port 25. I am not blacklisted, I have a PTR, I am running exchange 2003 my dns server is also 2003.
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Question by:kskelton
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LVL 104

Expert Comment

by:Sembee
ID: 17003342
And what happens when you email that domain?
Does it bounce? If so, what does the NDR say?

Is the banner on your SMTP service correct?

http://www.amset.info/exchange/dnsconfig.asp

Simon.
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Author Comment

by:kskelton
ID: 17003517
The banner is correct. The messages are stuck in the queue if I cancel the message the NDR is as follows:

The following recipient(s) could not be reached:

   xxx@sc.rr.com' on 6/28/2006 10:56 AM
            This message was rejected due to the current administrative policy by the destination server.  Please retry at a later time.  If that fails, contact your system administrator.
            <xxxx.rwtr.local #4.3.2>
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LVL 104

Expert Comment

by:Sembee
ID: 17003677
They are blocking you.
Many ISPs run their own blacklists, so while you may not be listed on any of the public ones, you may be on their private ones. You will need to speak to them to find out.

As a short term measure, setup an SMTP Connector to route email through your ISP.
http://www.amset.info/exchange/smtp-connector.asp

Simon.
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Author Comment

by:kskelton
ID: 17003724
I am able to send mail thru telnet. I don't think that they are blocking me.
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Author Comment

by:kskelton
ID: 17003799
Here is a NDR with a different message


The following recipient(s) could not be reached:

  xxx@sc.rr.com' on 6/26/2006 8:14 AM
  Could not deliver the message in the time limit specified. Please retry or contact your administrator.
  <xxx.rwtr.local #4.4.7>
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LVL 104

Expert Comment

by:Sembee
ID: 17003888
That is just a straight timeout.

However, your message above shows that the SMTP banner is .local - that will cause some sites to reject the email.
Change the banner to match what the server is known as on the internet and preferably the PTR record.

ESM, Servers, <your server>, Protocols, SMTP. Right click on the SMTP VS and choose Properties. Click on the last tab, Delivery and then advanced. Change the entry in the FQDN. Don't bother with check dns as that will probably fail.

Simon.
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Author Comment

by:kskelton
ID: 17004044
I changed it the message stayed in the queue so I killed the message and this is the NDR with the new change.


The following recipient(s) could not be reached:

      'beepback@sc.rr.com' on 6/28/2006 2:13 PM
            This message was rejected due to the current administrative policy by the destination server.  Please retry at a later time.  If that fails, contact your system administrator.
            <MX1.RWTRINC.COM #4.3.2>
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Accepted Solution

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Sembee earned 500 total points
ID: 17004143
If rwtrinc.com is your domain name, then they could be picky that the email doesn't come from your MX records.

http://www.dnsreport.com/tools/dnsreport.ch?domain=RWTRINC.COM

The MX records on the Internet appear to be Postini.

The remote site is still blocking you for some reason.

Simon.
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