We are receiving NDR notices on mail addressed to one domain at another company. They are recieving mail from everybody but us....and they are the only domain that we cannot mail to...
The error message is:
The following recipient(s) could not be reached:
firstname.lastname@example.org on 10/2/2004 8:31 AM
You do not have permission to send to this recipient. For assistance, contact your system administrator.
<exchangeserver.mycompany.com #5.7.1 smtp;550 5.7.1 <email@example.com>... Relaying denied>
a google search on this error message turned up two articles in the MS KB, on random NDRs.....283287 & 274638
Both mention several causes for NDRs, including bad MX records in DNS....not the case here, our DNS resolves internal addresses and is a redirector for to our ISP DNS for Internet addresses....the MX record points correctly to our single exchange 2000 server.
Beyond that, under Authentication on the Access tab of the default SMTP virtual server ( the only one we use) we had both anonymous access and Integrated Windows Access checked. When I changed that to uncheck Integrated and leave only anonymous, a test mail to the addresses in question came back with a new NDR:
firstname.lastname@example.org on 10/5/2004 12:09 PM
The destination system is currently not accepting any messages. Please retry at a later time. If that fails, contact your system administrator.
<exchangeserver.mycompany.com #5.3.0 smtp;554 5.3.0 rewrite: map site186_a not found>
Anybody got any ideas?