421 Internal Error

[S Ashok Kumar]

Hi,

I am running qmail-1.03 MTA. Whenever a message is delivered to a
Microsoft Exchange Internet Mail Server version 5.5.2448.0, it says "421
Internal error.".
But when I telnet to port 25 and deliver the same message, the message
is received. Has it got to do something with the way MS exchange server
interprets CR or LF fields?

Thanks in advance.

- Ashok