The following excerpt is from Expose v. Fay Servicing, Inc., No. 2:19-cv-1866-TLN-KJN PS (E.D. Cal. 2020):
2. See Cal. Civ. Pro. 415.30(a); see also, e.g., Wang v. Governor of California, 539 F. App'x 733 (9th Cir. 2013) ("Although California law does permit [substitute] service of a summons by mail, such service is valid only if a signed acknowledgment is returned and other requirements are complied with.").
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