The landlords sued and named two tenants, appellant and Dominguez, in their complaint for unlawful detainer. For reasons which do not appear from the record, the landlords elected to serve Dominguez and not appellant. The landlords took Dominguez’s default, and the deputy sheriff served on her a notice to vacate and ultimately evicted her and appellant. The sheriff is charged with the duty of serving “all process and notices in the manner prescribed by law.” (Gov. Code, § 26608.) When an order or process appears regular and valid on its face, and appears to have been executed by *1348