Type name: application Subtype name: tlsrpt+gzip Required parameters: N/A Optional parameters: N/A Encoding considerations: Binary Security considerations: Security considerations relating to SMTP TLS Reporting are discussed in Section 7. Security considerations related to gzip compression are discussed in RFC 6713. Interoperability considerations: This document specifies the format of conforming messages and the interpretation thereof. Published specification: Section 5.3 of RFC 8460. Applications that use this media type: Mail User Agents (MUAs) and Mail Transfer Agents. Additional information: Deprecated alias names for this type: N/A Magic number(s): The first two bytes are 0x1f, 0x8b. File extension(s): ".gz" Macintosh file type code(s): N/A Person & email address to contact for further information: See the Authors' Addresses section. Intended usage: COMMON Restrictions on usage: N/A Author: See the Authors' Addresses section. Change controller: Internet Engineering Task Force (iesg&ietf.org).