Publication 685 - Publication for Streamlined Mail Acceptance for Letters and Flats - Contents Appendix D Seamless Onboarding Checklist Onboarding Checklist Per DMM section 705.22 First-Class Mail, Periodic..." /> Publication 685 - Publication for Streamlined Mail Acceptance for Letters and Flats - Contents Appendix D Seamless Onboarding Checklist Onboarding Checklist Per DMM section 705.22 First-Class Mail, Periodic..." />