The Colorado Certificate of Mailing is a document issued by the Colorado Secretary of State's office that verifies that documents have been sent out through the mail. The Certificate of Mailing is used to establish the date of mailing for legal documents, to provide proof that documents have been sent, and to ensure that documents are received in a timely manner. There are three types of Colorado Certificate of Mailing: a Regular Certificate of Mailing, an Expedited Certificate of Mailing, and a Registered Certificate of Mailing. A Regular Certificate of Mailing is issued when documents are sent via the US Postal Service, and it verifies the date the documents were mailed. An Expedited Certificate of Mailing is issued when documents are sent via a private delivery service, such as FedEx or UPS, and it verifies the date the documents were delivered. A Registered Certificate of Mailing is issued when documents are sent via Registered Mail, and it verifies the date the documents were mailed and provides a tracking number for the package. The Colorado Certificate of Mailing is an important document for businesses, lawyers, and individuals who need to send documents in a timely and secure manner. It can also be used to provide proof that documents were sent on a certain date if there is ever a dispute.