(a) When notice of hearing is required by any provision of this act by specific reference to this section, such notice shall be published once per week for three consecutive weeks in some newspaper of the county authorized by law to publish legal notices. The first publication shall be made within 30 days after the order fixing the time and place of the hearing and, within seven days after the first published notice, the petitioner shall mail or cause to be mailed, postage prepaid, a copy of the notice to each heir, devisee and legatee or guardian and ward, conservator and conservatee or guardian ad litem, as the case may be, other than the petitioner, whose name and address is known to the petitioner. A copy of the petition, any attachments to it and, when applicable, a copy of the will, accounting and settlement agreement shall be included with the notice, unless excused by court order. The date set for the hearing shall not be earlier than 10 days and not later than 30 days after the date of the last publication of notice.

(b) Whenever notice is mailed to a person residing in a foreign country, such notice shall be mailed by air mail.