To mail a check safely, write it in permanent gel ink, put it in a security-tint envelope with a full return address, and hand it to a Post Office clerk instead of leaving it in a mailbox. For payments that need proof, add USPS Certified Mail, which gives you a mailing receipt and a delivery record with the recipient’s signature.
Mail theft is the reason those steps matter. A February 2023 FinCEN alert, issued with the U.S. Postal Inspection Service, reported that check-fraud Suspicious Activity Reports nearly doubled, from more than 350,000 in 2021 to more than 680,000 in 2022, with thieves stealing checks from the mail and “washing” them.
How do you write a check so it’s hard to alter?
Most check fraud starts with ink that can be dissolved or blank space that can be filled in. Write the check so nothing can be added or erased.
- Use a gel pen. Gel ink soaks into the paper fibers and is harder to wash off than standard ballpoint ink. Never use pencil or erasable ink.
- Write the payee name exactly as requested, and draw a line through any space left after it.
- Start the numeric amount right against the dollar sign and write the amount in words starting at the far left, ending with a line to the edge.
- Fill in the memo line with the account or invoice number so the payee can apply the payment and you have a reference.
- Sign the way your bank has your signature on file, and never mail a signed blank check.
Before you seal the envelope, photograph or note the check number, amount, payee and date. You’ll need those details if you ever have to stop payment.
What envelope should you use to mail a check?
Use a security envelope: one printed inside with a dense pattern so the check can’t be read when the envelope is held to light. Self-seal security envelopes are sold at office supply stores and most Post Offices.
If you don’t have one, fold the check inside a sheet of plain paper so nothing shows through. Don’t write “check enclosed” or a payment description on the outside, because that tells a thief exactly what’s inside.
How do you address an envelope for a check?
Copy the remittance address exactly as it appears on the bill or payment coupon. Many companies route payments to a lockbox address that differs from their main office, and a check sent to the wrong address can sit unprocessed.
- Line 1: Recipient or company name
- Line 2: Attention line or department, if the bill lists one
- Line 3: Street address or PO Box, with suite number
- Line 4: City, state and ZIP+4 code
Put your full return address in the upper left corner. Without it, a check that can’t be delivered has nowhere to come back to. The same address rules apply to anything you send, which our guide on how to ship a package for the best rates covers in more detail.
Where should you drop off a mailed check?
Take it inside a Post Office and hand it to a clerk, or drop it in the mail slot inside the lobby. Blue collection boxes are a common target, and FinCEN’s alert notes that thieves use makeshift “fishing” devices and stolen or counterfeit arrow keys to pull mail from them.
Don’t leave a check in your home mailbox with the flag up, especially overnight. If you must use a collection box, mail before the last posted pickup time so the check isn’t sitting there overnight.
When should you send a check by Certified Mail?
Use Certified Mail when you need to prove that you sent a payment and that it arrived, such as rent, a tax payment, a legal settlement or a final loan payoff. Under the Domestic Mail Manual (DMM 503), Certified Mail is available with First-Class Mail and Priority Mail and gives you a mailing receipt plus electronic verification of delivery or an attempted delivery. USPS keeps a delivery record that includes the recipient’s signature.
If you want a copy of that signature yourself, add Return Receipt when you mail it: a green hardcopy card (PS Form 3811) mailed back to you, or an electronic version sent by email. Our step-by-step guide on how to send Certified Mail walks through the form and the counter process.
| Option | Proof of mailing | Delivery record | Best for |
|---|---|---|---|
| First-Class Mail stamp | No | No | Routine, low-value bills |
| Certified Mail | Yes (mailing receipt) | Yes, with signature kept by USPS | Rent, taxes, legal or deadline payments |
| Certified Mail + Return Receipt | Yes | Yes, signature sent to you | Payments you may need to prove in a dispute |
| Registered Mail | Yes | Yes, with tight chain of custody | Very high-value or irreplaceable items (insurable up to $50,000) |
Certified Mail does not include insurance. That rarely matters for a check, because a lost check can be voided and reissued, but it’s why Registered Mail exists for items with real face value.
How long does a mailed check take, and does the postmark date count?
USPS lists First-Class Mail letters at 1 to 5 days, so mail a due-date payment at least a week early. Certified Mail travels with First-Class or Priority Mail, so it follows those delivery times.
Don’t rely on the postmark to prove you paid on time. Since December 24, 2025, DMM 608.11 states that a machine postmark shows the date of the first automated processing operation, which can be later than the day you dropped the envelope off. To get a postmark dated the day you hand it over, ask the clerk for a free manual (local) postmark at the counter, or use Certified Mail or a Certificate of Mailing, which give you a dated receipt.
How do you track a check you mailed?
A stamped First-Class letter has no tracking, so only Certified Mail (or Registered Mail) lets you follow a check. Enter the number from your Certified Mail receipt in USPS Tracking on usps.com to see acceptance, in-transit and delivery scans.
Save the receipt and a screenshot of the “Delivered” status with your payment records. If the payee claims they never got it, that record is your evidence.
What should you do if a mailed check never arrives?
- Ask the payee whether the check arrived or posted, and check whether it has cleared your account.
- Call your bank to place a stop payment if it hasn’t cleared, and watch your statements for an altered version of the check.
- Report suspected theft to the U.S. Postal Inspection Service at 1-877-876-2455 or online at uspis.gov.
- Reissue the payment once the stop payment is in place, ideally by Certified Mail or electronically.
The Postal Inspection Service also recommends picking up incoming mail promptly and contacting the sender if an expected check doesn’t arrive. Inspectors arrested almost 9,300 suspects for mail and package theft from 2019 to 2024.
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Frequently Asked Questions
Is it safe to mail a check in a regular envelope?
It works, but a plain envelope lets anyone holding it to light see the payee and amount. A security-tint envelope hides the check, and handing it to a Post Office clerk keeps it out of collection boxes that thieves target. FinCEN reported check-fraud reports nearly doubled from 2021 to 2022, so those small steps are worth it.
How long does it take a mailed check to arrive?
USPS lists First-Class Mail letters at 1 to 5 days, depending on distance. Certified Mail follows the same First-Class timeline but adds a mailing receipt and a delivery record. For a payment with a deadline, mail it about a week early and ask the counter clerk for a manual postmark dated the day you mail it.
Should I send a check by Certified Mail?
Send it Certified when you may need to prove payment, such as rent, taxes, legal settlements or a final loan payoff. Certified Mail gives you a mailing receipt and a USPS delivery record with the recipient’s signature. Add Return Receipt if you want that signature sent to you by mail or email.
What do I do if my mailed check is stolen?
Call your bank right away to stop payment, then watch your account for a washed or altered version of the check. Report the theft to the U.S. Postal Inspection Service at 1-877-876-2455 or at uspis.gov. Once the stop payment is confirmed, reissue the payment by Certified Mail or electronically.
Sources
- USPS Domestic Mail Manual 503: Extra Services (Certified Mail, Registered Mail, Return Receipt)
- USPS Domestic Mail Manual 608.11: Postmarks and Postal Possession
- USPS: Insurance and Extra Services
- USPS: Mail and Shipping Services
- U.S. Postal Inspection Service: Mail Theft
- FinCEN Alert: Mail Theft-Related Check Fraud (February 27, 2023), fincen.gov
Part of our Best Way to Mail Important Documents guide. Related: Can I Ship Tax Documents to the Irs, Precious Metal Shipping, What Is the Best Way to Send a Passport.
