Private Censorship of Mail Content

This provision empowers private postal and courier companies to unilaterally open mail they subjectively believe contains prohibited content. Combined with Section 39's vague prohibitions on "scurrilous," "grossly offensive," or materials "prejudicial to public safety," this creates a private censorship regime where service providers become speech arbiters without judicial oversight. The subjective "reason to believe" standard and absence of appeal mechanisms will chill legitimate expression—political criticism, controversial art, activist materials—as senders self-censor to avoid mail interception. This violates international freedom of expression standards requiring precise legal definitions and independent review of content restrictions.