Section 6617 - Notice of assessment; assessment corporations(a) It shall be the duty of the secretary of every assessment corporation, whenever an assessment shall have been made by it, to notify, not more than forty-five days thereafter, every person to which such assessment is applicable.(b) Such notice may be given personally, by an agent, or by a written or printed notice mailed, postage prepaid, to such person's last known post office address, and shall state the purpose of the assessment, the sum due from such person, and the time when and to whom payment thereof is to be made; but such time shall not be more than ninety days from the date of such notice.