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MX weirdness

Running zmailer from CVS as of June 13 I ran into this problem trying to
send mail to the domain mvista.com.  The two MX'es for the domain
mvista.com are apocalypse.mvista.com and messenger.mvista.com:

[ralf@lappi ralf]$ nslookup 
Default Server:  ether-spindle.corp.sgi.com
Address:  192.26.51.29

> set type=mx
> mvista.com
Server:  ether-spindle.corp.sgi.com
Address:  192.26.51.29

Non-authoritative answer:
mvista.com	preference = 10, mail exchanger = apocalypse.mvista.com
mvista.com	preference = 5, mail exchanger = messenger.mvista.com

Authoritative answers can be found from:
(root)	nameserver = fs1.corp.sgi.com
(root)	nameserver = fs2.corp.sgi.com
apocalypse.mvista.com	internet address = 63.192.221.46
messenger.mvista.com	internet address = 63.192.221.43
fs1.corp.sgi.com	internet address = 198.29.75.110
fs2.corp.sgi.com	internet address = 150.166.91.63
> set type=a
> mvista.com.
Server:  ether-spindle.corp.sgi.com
Address:  192.26.51.29

And this is the delivery-status data:

Reporting-MTA: dns; lappi
Arrival-Date: Wed, 23 Aug 2000 23:37:56 -0700
Local-Spool-ID: S868972AbQHXGh4
    
Original-Recipient: rfc822;jsun@mvista.com
Final-Recipient: RFC822;jsun@mvista.com
Action: failed
Status: 5.1.1 (bad destination mailbox)
Diagnostic-Code: smtp; 550 (<jsun@mvista.com>... Relaying denied)
Remote-MTA: dns; mvista.com (64.39.30.15|25|204.94.209.1|6785)
Last-Attempt-Date: Wed, 23 Aug 2000 23:40:46 -0700
X-ZTAID: smtp[1044]

Note that the remote side 64.39.30.15 which is the host mvista.com which is
none of the mail exchangers for the domain mvista.com, so why did zmailer
try to contact it.  Is this a known / fixed problem?

  Ralf