[vps-mail] What is Status: 4.4.1

[Jonathan Duncan <jonathan@xxxxxxxxxx>]

I have been getting reports that people are trying to send mail to users 
on one of my server and they mail is not going through.  I even got a 
message back that said the following:


-------------------------------------------------------
Reporting-MTA: dns; hercules.jkdwebmagic.com
Arrival-Date: Fri, 3 Mar 2006 07:18:10 -0700 (MST)

Final-Recipient: RFC822; address@xxxxxxxxxxxxxxxxxxxxxx
Action: delayed
Status: 4.4.1
Remote-MTA: DNS; mail.mangosteenalliance.com
Last-Attempt-Date: Fri, 3 Mar 2006 11:32:03 -0700 (MST)
Will-Retry-Until: Wed, 8 Mar 2006 07:18:10 -0700 (MST)
-------------------------------------------------------


Any ideas what the problem might be or where I should start looking?

Thanks,
Jonathan
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