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NO sends to certain domains

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2 replies

by robert.marsh

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ExchangeServer 5.5/SP4:
Mail server has been fine until 2 weeks ago. Then started gettin:
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The following recipient(s) could not be reached:

name@domain.com on 4/12/2002 12:51 PM Unable to deliver the message due to a communications failure
The MTS-ID of the original message is: c=US;a= ;p=MYDOMAIN;l=MAILSERVER-011413164856X-5
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DNS entries are fine in NT4/SP6a. No changes have been made to OS or Exchange. All service running (viewing Services). Re-applied Exchange SP4 and NT/SP6 andSP6a. Still same problem. Now there are about SIX domains that bounce back.

Is this a PR_RESPONSIBILITY issue? Is this a corrupt Exchange file?

HELP!!!

2 replies

by shmaltz

Can you connect to the target domain at all?
Try the following:
1. Find out the mail server of the target domain (most of the times mail.domainname).
2. At a command prompt type telnet domainname 25 (intiates a SMTP connection to the target domain)
3. Type: Helo and press enter
If you get a respond then you can connect from your network to the target networks email server, If you can't then make sure that thier email server works (by using another network). If you know that the targets email server works, Then try to ping the target computer. If this also fails but you know thier email server is running contact you ISP.
Also contact the target email server administrator, ask him if your email server and/or IP address is blocked.
If spam is not disabled on your email server, then someone might have used your email server for spamming, and that might have landed you on a restricted email servers list.

by shmaltz

If this problem is only with some Domains but others work. Then the problem is not a corupption in Exchange.
You mention that your DNS is OK. Make sure that it realy is.
To do that:
1. Use a whois server to get the Authorized DNS Servers for the target domain. At the command prompt (In windows 2000) type nslookup and press enter.
2. Type: server IPAddress (the Ip address you obtained from the whois lookup)
3. Type: set type=MX
4. Type: domain name
Make sure that the answer to the last query is the same you are getting when your Exchange server is trying to resolve the IP address from the target email server. You can do that by not doing step 2 above, and see what you get.

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