Mail User Not Found (But he *is* there!)

OK just when I thought I was completely "pau" with all migration issues (Hawaiian for done... end of day, time to go surfing :-)...

at domain "Jnanadana.com" we have a user

Kauai_Hindu_Monastery email only

I can go to www.jnanadana.com:20000 and log in as that user and Viola, indeed, he is granted access, he has a mail box etc.

BUT! If I log in as www.himalayanacademy.com:20000 htde-support and try to send a email to:

"kauai_hindu_monastery@jnanadana.com" (this way I can eliminate Postini as I think the email never leaves the box...)

I get an "unknown user" msg from Postfix:

This is the mail system at host sat.gurudeva.org.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system

(expanded from
): unknown user:
"kauai_hindu_monastery.jnanadana"

Reporting-MTA: dns; sat.gurudeva.org
X-Postfix-Queue-ID: 7BE6088079
X-Postfix-Sender: rfc822; htde-support@himalayanacademy.com
Arrival-Date: Sun, 8 Jun 2008 18:58:42 -0700 (PDT)

Final-Recipient: rfc822; Kauai_Hindu_Monastery.jnanadana@sat.gurudeva.org
Original-Recipient: rfc822; Kauai_Hindu_Monastery@jnanadana.com
Action: failed
Status: 5.1.1
Diagnostic-Code: X-Postfix; unknown user: "kauai_hindu_monastery.jnanadana"

And I have reports from outside that mail to this address is bouncing.

Status: 
Closed (fixed)