The applicant shall mail notices, postmarked no less than thirty (30) days nor more than thirty-five (35) days before the hearing, to the owners as well as the occupants of all adjoining properties within five hundred (500) feet of the exterior limits of the applicant's total property holding, as shown on the current tax roll; with the exception of applications in the R-15, R-10, R-7 and R-5 Zoning Districts, where notification to adjoining property owners and occupants shall be to those within two hundred (200) feet of the exterior limits of the applicant's total property holding, as shown on the current tax toll. In addition, the applicant shall provide a certificate of mailing for each recipient, which legibly indicates the name and address of the person, including the occupant, to which the notice was mailed, and is duly certified by the post office. The applicant shall also file an affidavit of mailing, together with the duly certified certificates of mailing, to the Planning Department no less than five (5) working days before the hearing. Said affidavit shall include the name of the person that actually mailed the notices and the names and addresses of the property owners and the addresses of the occupants that were notified. Failure to mail the notices and/or provide the affidavit and/or the certificates of mailing to the Planning Department may result in postponement of the public hearing.