SMTP Error 5.5.0

I am running MS Exchange Server 2007 and have the following issue.  I have a user who is a member of an association that uses a distribution list for email.  When mail is sent to the disribution list my user does not recieve the message and the origional sendor recieves a NDR that states:

There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
            < #5.5.0 smtp;552 Requested mail action
aborted: exceeded storage allocation>

I have checked the storage limits within my Exchange organization and everythign is ok.  My question then is who has the problem me or the origional sender of the email?
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Michael WorshamStaff Infrastructure ArchitectCommented:
Check your MAILBOX STORE LIMITS tab in the Exchange System Manager.  Make sure your storage limits are unchecked, or set higher if you choose.  Also if you have deleted item retention turned on below, it will retain those items after deleting them from the mailbox for the number of days specified.  So, even if you delete items from a mailbox, Exchange may be retaining that size until after the days specified.

To check the individual message size limit, go to the SMTP server properties and check the MESSAGES tab for the LIMIT MESSAGE SIZE option.  You may need to increase that if it is set low.
To answer your question, that message is from the senders SMTP connector. Not yours.
bsgabrielAuthor Commented:
I have checked all my exchange limits as well as and firewall settings that may impact the delivery of mail.  From what i can see i have no limits in place that should be preventing these emails.  Since the error message specifically mentions exceeded storage limits my storage limits are as follows:

Issue warning at KB = 800000
Prohibit sent at KB    = 950000
Prohibit seand and recieve at KB = 100000

I have checked the users in question and they are well below these limits.  
Michael WorshamStaff Infrastructure ArchitectCommented:
You might want to contact the end-user's site and ask them to check their incoming e-mail environment as there is a limit block in place that is preventing your messages from coming through.

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