550 administrative prohibition

Hi Experts,

Does anyone know what this error means?

• Verdict: Details

• Verdict	Filter Policy	Policy Group	Details
  None	default	default	None

• Delivery: Failed Details

• Delivery Failure	Failure Time	Details	Recipient
  Attempted Delivery to:	Wednesday, Dec 03, 2014 11:27:46 AM CET	550 administrative prohibition	company.com

I was looking for the recipient's address if it is on any list but it is not added.

We are currently using SMG version 10.5.2-3 . Any help is much appreciated. 

Thanks in advance!

Cheers,

Rey