Unable to get incoming mails

[Michael Voight]

Kandhalu Bhaskar wrote:
> 
> I have a Linux m/c as a front-end to the internet running BIND 4.9.6.  Then
> I have 2 WinNT machines acting as Primary and Seconday DNS servers, again
> running on BIND 4.9.6. The secondary DNS machine also acts as Mail server,
> running MS Exchange 5.5 + Internet mail service. Recently, the secondary
> DNS suffered a disk crash and we had to replace the disk and reinstall NT
> server, BIND and MS exchange.
> 
>      We had a backup of the db files of BIND and was restored.
> 
>      My problem now is that MS exchange is able to send outgoing mails but
> incoming mails are getting bounced with the message "The recipient name is
> not recognized. Unknown recipient". When I enable the logging in MS
> exchange, I can see that the incoming mail is coming as close as upto the
> mail server, but then gets bounced from there. I can even see a whole copy
> of the incoming mail in the log.
> 
>      Is this a problem with the DNS configuration or MS Exchange - Internet
> mail service configuration.  And how to resolve this ?

Is reverse addressing working? If so, then it looks like a MSE issue.