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Home > Guides > Serving legal papers by mail
Sometimes. Many courts allow routine papers to be served by certified or registered mail once a case is underway, but initial pleadings, like a complaint and summons, often require personal service or follow strict mail rules. The exact answer depends on your state or province, your court, and the document. Getting the method wrong can invalidate service entirely.
This is general information, not legal advice.
| Document type | Mail service usually allowed? |
|---|---|
| Routine motions and notices after a party has appeared | Often yes, including by regular first-class mail in many courts |
| Small claims papers | Certified mail is allowed in many states |
| Initial complaint and summons | Often requires personal service first; mail only where the rules allow it |
| Subpoenas | Varies widely; some states allow certified mail, others demand personal delivery |
| Documents to an opposing attorney | Usually yes, by first-class mail or the court's electronic system |
Service of process is how a court makes sure a person actually knows about a case against them. Personal delivery is the gold standard because it leaves no doubt. Mail is a step down in certainty, so courts that permit it usually demand a paper trail: certified mail in the U.S., registered mail in Canada, with a signed receipt or delivery record proving the piece reached the right hands. A regular stamp is rarely enough for the first document in a case.
Mail shines for the ongoing paperwork of an active case. After the other side has appeared, most courts let attorneys serve each other by mail or electronically, and ordinary notices to parties work fine by first-class mail. Small claims courts are also friendlier to mailed service; many explicitly let a claimant serve the defendant by certified mail, return receipt requested. The signed green card then becomes your proof of service to file with the court.
The biggest trap is assuming a green card equals valid service. If the rules required personal service and you used mail anyway, the recipient's signature does not save you: service was defective. Another trap is mailing to the wrong address; the rules typically require the address where the person actually lives or does business, and old addresses can void service. A subtler one: some courts treat a refused or unclaimed certified letter as served, but others do not, and you will not know which rule applies until you check.
The concept exists on both sides of the border, but the rules differ by province just as they do by state. Ontario's rules, for example, allow certain documents to be served by mail with an acknowledgment of receipt, while other documents need personal service or a court order for an alternative method. If the recipient is in another province or country, additional rules about cross-border service may apply. The principle is the same everywhere: check the court rules before you mail anything, not after.
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