The Oregon Certificate of Mailing To The Division Of Child Support (DCS) is a document that serves as proof that a document has been sent to the DCS. This document is usually used when sending payment, documents, or other types of correspondence to the DCS. There are two types of Oregon Certificate of Mailing To The Division Of Child Support (DCS): Certified and Registered. Certified mailing requires the sender to provide proof of mailing to the DCS and requires a return receipt for signature. Registered mail requires the sender to provide a receipt and proof of delivery to the DCS. Both types of Oregon Certificate of Mailing To The Division Of Child Support (DCS) require the sender to provide a copy of the document being sent along with the certificate.