You may be on a spam list meaning you allow people to relay off of you and
then spammers can use your server to send mail. If yahoo.com and AOL.com
both don't allow you to send to them this is most likely the case. Is this
exch 5.5 or Exch 2000. You need to prohibit relay to authenticated users
Microsoft Messaging Support
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Common abbreviations that may be found in my posts:
E2K = Exchange 2000
ADC = Active Directory Connector
ESM = Exchange System Manager
AD U&C = Active Directory Users & Computers
OWA = Outlook Web Access
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| Newsgroups: microsoft.public.exchange.admin
| Subject: Can't send messages to certain domain
| Date: Fri, 31 Aug 2001 10:39:26 +0800
| Organization: LinkAGE Online a PSINet Company
| Lines: 11
| NNTP-Posting-Host: pc038.michelhk.com
| X-Trace: news.hk.linkage.net 999225501 17519 188.8.131.52 (31 Aug 2001
| NNTP-Posting-Date: 31 Aug 2001 02:38:21 GMT
| X-Priority: 3
| X-MSMail-Priority: Normal
| X-Newsreader: Microsoft Outlook Express 5.50.4807.1700
| X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4807.1700
| Xref: cppssbbsa01.microsoft.com microsoft.public.exchange.admin:279966
| X-Tomcat-NG: microsoft.public.exchange.admin
| Our exchange server 5.5 sp4 is running on WinNT 4.0 sp6a, we found that we
| can't send to certain domain (aol.com), the error message prompted "421
| service not available, temporary dns failure". I check with our ISP, the
| DNS lookup is not the problem issue, we can successful lookup mx record
| aol.com domain.
| Pls advise how to solve the above problem.