A mailing record can show that a Duty to Warn notice was sent. It does not, by itself, show that the customer received or read it. Keep the notice version, address list and mailing evidence together. If you need more than mailing proof, ask counsel which delivery record to buy.
Reviewed Oct 2026
Name the evidence accurately
A USPS Certificate of Mailing records when USPS was given the mail. Ask which extra services provide delivery records for the mail service you choose.
Use clear file labels: sent, delivery record on file, returned or receipt confirmed. Call a batch confirmation what it is. That honesty holds up when someone reviews the file.
Build a record for one address
As an office method, start with the address as it appeared on the final list. Link it to the exact warning piece and mailing date. Add later evidence without changing the original entry.
Keep the limits visible
If a customer confirms receipt, save what they said and when. A note that a brochure was handed over should say who made the note. Keep those records tied to the event they describe.
Questions and answers
Does a mailing confirmation prove reading?
No. Describe it as mailing evidence. Do not label it proof that the customer read the warning.
What does a USPS Certificate of Mailing show?
It records when the item was given to USPS to mail. It does not supply a delivery receipt.
Should we buy a signed delivery service?
Have counsel specify the evidence your program needs. Then confirm which postal service supplies that evidence.
What if a piece comes back?
Keep the returned item with the batch record. Track the address review and any new attempt as separate events.
About Bill Stomp
Bill Stomp built Propane Safety Pro. He is a war veteran who ran over 87 propane branch offices across 12 states, and he has helped more than 200 propane companies improve their profits, sales, safety and operations.
Next step
See the mailing service and its confirmation record. Tell us your customer count and we'll show you the mailing confirmation you'd get for your file.
General information, not legal advice.