1. Every regular application must be supported by proper certificates of
good moral character, health, and physical and mental capacity for doing
the public work, the certificates to be in such form and number as the
regulations of the Commission shall provide; but no certificate will be
received which is inconsistent with the tenth section of the
civil-service act.
2. No one shall be examined for admission to the classified postal
service if under 16 or over 35 years of age, excepting messengers,
stampers, and other junior assistants, who must not be under 14 years
of age, or to the classified customs service or to the classified
departmental service if under 18 or over 45 years of age; but no one
shall be examined for appointment to any place in the classified customs
service, except that of clerk or messenger, who is under 21 years of
age; but these limitations of age shall not apply to persons honorably
discharged from the military or naval service of the country who are
otherwise duly qualified.