In most civil cases in Arizona, certified mail alone is NOT sufficient for initial service of process. Arizona Rule 4.1 generally requires personal or substitute service, not mail.
For initial service of a summons and complaint in Arizona civil court, certified mail does not satisfy the requirements of Arizona Rule 4.1. Personal or substitute service is required.
Arizona Rule 4.1 lets a plaintiff notify the defendant that an action has been commenced and request that the defendant waive service of a summons. If the defendant signs and returns the waiver, formal service is not required, and the waiver does not give up objections to personal jurisdiction or venue.
Serving state agencies and government entities sometimes allows certified mail under specific statutory provisions. Verify the applicable statute for each entity.
Arizona Rule 4.2(c) permits service by mail on a party outside Arizona when the party's whereabouts are known, and service is complete when the signed receipt is returned. A mailed receipt is not the same as personal service, so confirm the rule and your court's practice before relying on it.
When substitute service is used (leaving papers with another person at the defendant's home), a follow-up mailing IS required — but this is in addition to, not instead of, in-person delivery.
Maricopa County
Pinal County