How is the summons and Dispossessory action served on the Tenant?

Personal service on the Tenant of the Dispossessory complaint and summons must be attempted. In the event the Sheriff/Constable cannot serve the Tenant personally, the Sheriff/Constable may serve the Dispossessory complaint and summons, sui juris, that is, to any person residing at the premises of suitable age and discretion. If the Sheriff/Constable is unable to obtain personal or sui juris service of the summons and Dispossessory complaint on the Tenant, the summons and Dispossessory complaint may be delivered by tack and mail, that is, posted on the door of the premises. On the same day of posting, the Sheriff/constable's office must mail a copy of the summons and Dispossessory complaint to the Tenant at the Tenant's last known address.