California Codes, Code of Civil Procedure - CCP, Part 2 — Of Civil Actions, Title 5 — Jurisdiction and Service of Process, Chapter 4 — Service of Summons, Article 3 — Manner of Service of Summons, Section 415.40
A summons may be served on a person outside this state in any manner provided by this article or by sending a copy of the summons and of the complaint to the person to be served by first-class mail, postage prepaid, requiring a return receipt. Service of a summons by this form of mail is deemed complete on the 10th day after such mailing.
Notes
Allows service of summons on a person outside California by any method authorized by the chapter or by first-class mail requiring a return receipt. When service is made by that mail method, service is complete on the 10th day after the summons is mailed.
Use as reference
Lexinter.net | California Code, Code of Civil Procedure - CCP § 415.40 | https://laws.lexinter.net/codes/california/code-of-civil-procedure/part-2/title-5/chapter-4/article-3/section-415-40