Ala. Code § 6-5-155.4

A copy of the summons and complaint shall be served upon the defendant at least five business days prior to the first hearing in the action. Service shall be made in accordance with the Alabama Rules of Civil Procedure. If personal service cannot be made, service may be made by posting the papers at the property. If service is made by posting papers to the property, a copy of the summons and complaint shall be mailed to the last known mailing address, if any, of the defendant.