Mail screening
Mail screening is the physical screening of post/mail prior to reaching its final destination. This may be from a postroom/mailroom or from an external premise through a professional mail screening provider.
Typically this is a security function of an organisation and differing levels of security are required for mail screening depending on the risks associated with/to the organisation.
A specification for mail screening and security provides relevant information on what is important for an organisation. This is available from BSI Group.
Professional security consultants will have an in-depth knowledge of these processes.