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Under the Nevada Rules of civil procedure Rule 4, which you can read at this link it states the following for the service of documents in a civil proceeding
(c) By Whom Served. Processshall be served by the sheriff of the county where the defendant is found, orby a deputy, or by any person who is not a party and who is over 18 years ofage, except that a subpoena may be served as provided in Rule 45; where theservice of process is made outside of the United States, after an order ofpublication, it may be served either by any person who is not a party and whois over 18 years of age or by any resident of the country, territory, colony orprovince, who is not a party and who is over 18 years of age.
That means, that yes it must be in person and service by mail is not a valid service.