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PS Form 3615 - Mailing Permit Application and Customer Profile
Two forms of identification are required when submitting this application. One form of ID must contain a photograph of the applicant(s).
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myGRANT Help - Sponsor Program Information
Sponsor Deadline Type (Required): Click in the field to view the available options. Scroll to select one: Postmark, Receipt, Target. Postmark: Date by which
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Treat Electronically Submitted Tax Payments and Documents
Therefore, if the postmark shows a document or payment was mailed by the due date, it will be considered timely, even if it is received after the due date. IRC
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