Must plaintiff serve defendant using Sheriff?

You can serve either via certified mail and have a return receipt or by sheriff. Certified mail is cheaper since the sheriff’s dept. rates vary from state to state. However using the sheriff is more reliable.

2 questions for a self fied divorce. We have agreed mutually to divorce, the only issue is about service of the divorce papers:

1.How do you serve a defendant whose address is known but the address is out of state?

2.Is it mandatory to serve the spouse using a Sheriff?