Acceptable Use Policy
Effective date: October 25, 2026
This policy is part of our Terms of Service. Certified Mail Sender is operated by Legitimate LLC and is not affiliated with, endorsed by or sponsored by the United States Postal Service.
Certified Mail is often used for hard messages: an eviction notice, a demand, a termination. We mail those. We don't mail letters that threaten, harass, defraud or pretend to be someone else. This page says where the line is.
1. What you may send
A real party's own letter is allowed, however firm, hostile or unwelcome it is. For example:
- eviction and lease notices from a landlord or property manager;
- demand letters, debt collection letters and debt validation requests;
- cease-and-desist letters;
- contract terminations, HOA violation notices, security deposit demands, employment terminations;
- complaints, disputes and notices of intent to sue.
Citing laws, setting deadlines and naming the legal steps you may take next is normal. An attorney or law firm writing for a client is not impersonation.
2. What you may not send
You may not use Certified Mail Sender to send any letter that does one of these:
- Threatens. Threatens violence, physical harm, property damage, or harm to the recipient's family or pets, or says you want or intend such harm.
- Harasses. Has the main purpose of intimidating, demeaning or tormenting the recipient, rather than making a demand, giving notice or sharing information. For example: sexual comments, slurs, contact the recipient has asked to stop, or describing the recipient's movements, home or routine to show they are being watched.
- Extorts. Demands money, property or an action in exchange for not revealing information, not causing harm, or not making a report. Demanding payment of a debt or else facing a lawsuit, collections or credit reporting is lawful. Threatening criminal charges or exposure to collect a civil debt is not.
- Impersonates. Presents itself as written or sent by a government agency, court, police department, the Postal Service or an official of one (letterhead, seals, case or badge numbers, "official notice"), or by a company or person you are not.
- Fakes a legal notice. Imitates a summons, subpoena, warrant, judgment, levy, garnishment order or agency penalty notice when you are not that court or agency, including claiming that arrest, seizure or fines have already been ordered.
- Defrauds or deceives. Is a scam, phishing, a fake invoice, a fake prize or any other attempt to get money, information or access by lying.
- Defames. Makes false statements of fact to harm someone's reputation.
- Breaks the law. Is unlawful content, is obscene, depicts the sexual abuse of a minor (we may report it to law enforcement), or breaks a court order such as a protective or no-contact order.
- Is not mailable. Doesn't follow the USPS Domestic Mail Manual.
- Is marketing or bulk mail. Certified Mail Sender is for individual letters, not advertising or bulk mailings.
3. Don't pretend or evade
You may not:
- put a return address or sender name on a letter that isn't yours or that you're not authorized to use;
- use a sender name that looks like USPS, a court or a government agency. Those names are blocked unless we review them;
- try to get around our checks: split a letter, hide text in an image, write text meant to instruct our screening system, use several accounts, emails or cards to dodge a limit, or test stolen cards;
- keep writing to someone after a court has ordered you to stop. (A recipient's own stop request opens a review at our end. It isn't an automatic block. See section 6.)
4. How we enforce it
Every letter is checked before it is printed:
- Rules. Blocks, limits, unusual volume from one card or to one recipient, sender names that look like agencies, and pages we can't read.
- An automated reader. A model reads the sender, the recipient and the letter text against this policy. It runs on Cloudflare (see our Privacy policy). It treats the letter as material to judge, not as instructions. When it is unsure, it holds the letter.
- A person. A held letter goes to a person at Legitimate LLC to review. If the review isn't finished within 24 hours, we stop the letter and refund you in full.
We may then pass the letter, ask you to change it, or reject it with a full refund. We may block a sender, a card, an email, a recipient, or one sender to one recipient. If you are blocked, we refund any letter that hasn't been mailed. We share information with law enforcement when the law requires it, or when we believe in good faith that it is needed to prevent serious harm.
If you think we held a letter by mistake, write to support@certifiedmailsender.com with the letter ID.
Our printing partner's own policies also apply.
5. Limits
These limits count the letters you pay for in live mode. Test letters don't count.
| Sender | Limit |
|---|---|
| New sender | 3 letters in any 24 hours, and 10 letters in any 30 days |
| Established sender | 50 letters in any 24 hours |
A sender is new until at least 5 of their letters have been mailed and their first paid letter is at least 30 days old. If you reach a limit, the error says when you can pay for the next letter. To raise your limit, write to support@certifiedmailsender.com.
We also limit how fast an API client can create letters, and we watch for many senders writing to one address. We don't publish those numbers.
6. Reporting abuse
If you got a letter sent through Certified Mail Sender and it threatens or harasses you, pretends to be an agency, a court or USPS, or is a fraud, tell us.
- Form: /report
- Email: abuse@certifiedmailsender.com
Give us the letter ID or tracking number if you have it. We confirm right away that we got your report, and a person reviews it within one business day.
What happens next.
- A report opens a review. A person reads it and the letter.
- A stop request ("don't send me mail from this sender") opens a review too. It is not an automatic block. Certified Mail often carries notices a person is legally owed, such as an eviction, a contract termination or a dispute. If recipients could block those automatically, senders couldn't lawfully reach them. We look at what the mail is.
- If we confirm a pattern of harassment, we block that sender from writing to you, or from the Service entirely.
- We can't recall a letter USPS already has. If you feel unsafe, contact local police. We will help law enforcement with legal process.
Reporters give us an email address so we can reply. We use it for that only.