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Critical Mail


For your business

Critical Mail® is a convenient shipping option for Commercial Plus® mailers. It’s a great way to send important documents, tickets, or high-impact direct mail at a competitive price with the reliability and security you expect from USPS®.  It includes USPS Tracking™ service so mailers can track their mailpieces and confirm delivery, and $100 in insurance coverage against loss, damage, or missing contents – at no additional cost.

This product is a sub class of Priority Mail®, and is available for automation-compatible letters and flats.

There are 4 options with Critical Mail…

  • Critical Mail Letter
  • Critical Mail Letter with Signature
  • Critical Mail Flat
  • Critical Mail Flat with Signature

Critical Mail services can also be used as a return or reply vehicle.


  • Free USPS custom envelopes fit in most mailboxes
  • Includes $100 in insurance coverage
  • Multiple pickup options available
  • Offers secure mailbox delivery on first attempt
  • No surcharges for fuel or Saturday, residential, and rural delivery
  • Sunday and holiday delivery service available for a small fee
  • Reaches every U.S. address, plus PO Box™ addresses, and most APO/FPO/DPO destinations
  • Includes USPS Tracking™


Downloadable Pricing File
Critical Mail

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Compare other USPS® mailing and shipping services ›

With Critical Mail®, you already get …

USPS Tracking™ to see tracking updates, including date and time of delivery or attempted delivery.

Insurance coverage of $100.

You can add the following options online…

Insurance additional coverage up to $5,000.

Signature Confirmation™ to see when it was delivered or delivery was attempted, and add security by requiring a signature.

Learn more about Extra Services for business mailings ›

Priority Mail Flat Rate® Shipping. Get free Priority Mail® supplies. Image of Priority Mail boxes and envelopes. Sign Up for an Account. Access services for business mailers online.  Register at the Business Customer Gateway. Image of a computer mouse. Ship Online. Print a label with postage. Image of computer printer with shipping label and brown box.