Mail service to Syria may be restricted. Please check http://about.usps.com/news/service-alerts for current service information.
The following items are some of the limited types of shipments that may be allowed under U.S. law without the need for an export license:
PS Form 2976, Content Description Section
PS Form 2976-A, Block 5
PS Form 2976-B, Block 2
Additional information on current sanction programs and specific information on what items can be mailed to sanctioned countries is available at www.treasury.gov/ofac and www.bis.doc.gov.