Publication 685 - Publication for Streamlined Mail Acceptance for Letters and Flats - Contents 6 Seamless Acceptance 6 Seamless Acceptance 6-1 Program Overview 6-2 Participation Criteria 6-2.1 Mail Preparat..." /> Publication 685 - Publication for Streamlined Mail Acceptance for Letters and Flats - Contents 6 Seamless Acceptance 6 Seamless Acceptance 6-1 Program Overview 6-2 Participation Criteria 6-2.1 Mail Preparat..." />