Email is being rejected as "not authorized" to .ru recipient

Delivery has failed to these recipients or distribution lists:
<email address>@<domain>.ru
Your message wasn't delivered because of security policies. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator.
The following organization rejected your message:
Sent by Microsoft Exchange Server 2007

Is this blocked by another party or can it be resolved by an exchange server setting?
Who is Participating?
PortableTechConnect With a Mentor Commented:
This appears to be on the reciepient side of the connection.  Usually when I see this error, it means the destination email address you sent your message to is really a distribution list which does not allow outside email to be sent to it.  Having said that however, it is possible to put such delivery restrictions on reciepient mailboxes as well.  Eitherway it appears this needs to be fixed in Exchange on the reciepient's side of the connection.  
is your domain
directpointeAuthor Commented:
is your domain

its not
pmorton23Connect With a Mentor Commented:
then I agree with Portable, the dist list is probably locked down. it is not typical to set a user mailbox with such permissions. over the size limit on a mailbox can cause rejected emails also. the error states due to security it will not be delivered.
our company has over a hundred dist list that have security enabled so only certain groups or users can send to them.
directpointeAuthor Commented:
As always, thanks for your contributions!
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