Haw. Rev. Stat. § 653-7: Service on garnishee.

Service of the copy upon the garnishee may be made in any of the manners here described, namely:

(1) If the garnishee lives or has an office in the district in which process is issued, by the officer's handing a copy to the garnishee in person or leaving it in the garnishee's office in charge of some deputy or clerk or other employees or attache of the office; or

(2) If the garnishee lives in a district other than that in which the process was issued, by an officer's handing a copy to the garnishee in person, or by mailing it in a sealed envelope, registered or certified, postage prepaid, return receipt requested, and addressed to the garnishee's home or business address.