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Some small claims documents in Ontario can be served by mail, but the claim that starts the case generally requires personal service, meaning handing it to the defendant. Mail service usually needs the recipient's signed acknowledgment to count. Get the method wrong and the court can set your service aside, so confirm the current rules before you mail anything.
This is general information, not legal advice.
| Document | How Ontario generally treats mail service |
|---|---|
| The plaintiff's claim (starts the case) | Generally requires personal service; mail alone usually doesn't count |
| Later steps (defence, motions, other filings) | Mail is allowed in more situations, often paired with a signed acknowledgment of service from the recipient |
| Demand letter before suing | Not court service at all; mail is fine and registered mail gives you proof you sent it |
The claim is the document that drags someone into court, so the rules insist on proof the person actually got it. Personal service means handing the document to the defendant directly (or to someone at their home in prescribed circumstances). A letter in the mail might reach them, but the court can't be sure of that without more. That's why mail service of later documents usually hinges on the acknowledgment: the recipient signs a form confirming receipt, and that signature is what makes the service count. No signed acknowledgment, no proof, and you're back to personal service.
Whenever you serve a document, someone has to swear an affidavit of service: a sworn statement saying who served what, on whom, when, and how. It gets filed with the court as your proof. If you served by mail, the affidavit describes the mailing, and you attach the supporting evidence: the registered mail receipt, the tracking record, the signed acknowledgment. Keep everything. A service challenge months later is decided on paper, and the party with the tidy file wins those fights.
Yes, as evidence, but it doesn't replace the rules. Sending by registered mail proves you mailed the document and shows the delivery outcome, which strengthens your affidavit of service. It does not turn an invalid method into a valid one: if the rules required personal service and you mailed it registered instead, the signature receipt won't save you. Use registered mail to document a service the rules already allow, not to shortcut a service they don't.
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