Special Proceedings
Section 4. Heirs, devisees, legatees, and executors to be notified by mail or personally. - The court shall also cause copies of the notice of the time and place fixed for proving the will to be addressed to the designated or other known heirs, legatees, and devisees of the testator resident in the Philippines at their places of residence, and deposited in the post office with the postage thereon prepaid at least twenty (20) days before the hearing, if such places of residence be known. A copy of the notice must in like manner be mailed to the person named as executor, if he be not the petitioner; also, to any person named as coexecutor not petitioning, if their places of residence be known. Personal service of copies of the notice at lest (10) days before the day of hearing shall be equivalent to mailing.
If the testator asks for the allowance of his own will, notice shall be sent only to his compulsory heirs.