Section 2
SEC. 2. The mail above referred to shall be received and carried only when plainly marked with the words "Official Mail," under which the official sending same shall affix his official signature in writing or by stamp.
SEC. 2. The mail above referred to shall be received and carried only when plainly marked with the words "Official Mail," under which the official sending same shall affix his official signature in writing or by stamp.
CitationAct No. 179 Section 2 (LawPlayer, data as of July 4, 2026)
Source: Supreme Court E-Library, Republic of the Philippines. Philippine laws are public documents (works of the government).