Home » Other » What does an Optional Procedure Mailing System Application Look Like? What does an Optional Procedure Mailing System Application Look Like? admin 04/09/2017 Other No Comments PS Form 3626 is used as Optional Procedure (OP) Mailing System Application that looks like this: Tweet Pin It Related Posts What does an Application for Picture Permit Imprint Look Like? What does a Bulk Proof of Delivery Application Look Like? What does a Renewal Notice for Annual Fee(s) Look Like? Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *Comment Notify me of follow-up comments by email. Notify me of new posts by email.