A copy of the peace order shall be served on the victim, the respondent, the appropriate law enforcement agency, and any other person the court determines is appropriate, in open court or, if the person is not present at the peace order hearing, by first-class mail to the person’s last known address. A copy of the peace order served on the respondent in accordance with subsection (a) of this section constitutes actual notice to the respondent of the contents of the peace order. Service is complete upon mailing.