The Oregon Certificate of Mailing (Response) is a document issued by the Oregon Department of Revenue that is used for the purpose of recording the date, time, and type of mailing of certain documents. This certificate is typically used to document and confirm that an Oregon taxpayer has responded to a request for information, or to mail a payment to the Oregon Department of Revenue. The Oregon Certificate of Mailing (Response) comes in two forms: the Standard Certificate of Mailing (Response) and the Certified Certificate of Mailing (Response). The Standard Certificate of Mailing (Response) is used to record the date, time, and type of mailing of documents to the Oregon Department of Revenue. The Certified Certificate of Mailing (Response) is used to record the date, time, and type of mailing of documents to the Oregon Department of Revenue and also serves as a receipt for the Oregon Department of Revenue. Both forms must be completed in full and signed by the taxpayer.