Government Code § 26748

In addition to the fees provided by this article, the sheriff may collect from the litigant or person requiring his services, his actual expenses for inspection, checking, releasing, or any other handling of property under his custody, charge, or keeping pursuant to any process, writ, order, paper, or notice, and actual postal charges paid for mailing by registered mail or certified mail any notice or demand required or authorized by law to be sent by registered mail or certified mail.