Which mail type is specifically intended for educational institutions and libraries?

Library Mail is specifically intended for educational institutions and libraries, allowing them to send materials such as books, manuscripts, and educational resources at a reduced postage rate. This mail type is designed to facilitate the distribution of educational content, making it more affordable for libraries and educational organizations to share resources with one another. Unlike other mailing options, Library Mail has stringent eligibility criteria regarding what can be sent, which reinforces its purpose of supporting institutions in the sharing of educational materials. This specialized service recognizes the importance of libraries and educational institutions in promoting access to information and learning resources, ensuring that these entities can efficiently manage their communications and material distribution.