Oregon Certificate of Service Mailing is a service provided by the Oregon State Bar which allows individuals and entities to mail documents to other individuals or entities. It is used to provide proof of service for documents that have been sent through the mail. There are two types of Oregon Certificate of Service Mailing: Certified Mail and Electronic Service. Certified Mail is sent through the United States Postal Service (USPS) and requires a signature from the recipient upon delivery. Electronic Service is sent over the internet and requires an electronic signature from the recipient. Both services provide proof of service and can be used to meet the legal requirements for service of process.