…enPGP key for the given mail address. The key needs to carry a User ID packet ([RFC4880]) with that mail address. Note that the key may be revoked or expired - it is up to the client to handle such conditions. To ease distribution of revoked keys, a server may return revoked keys…

…Resource Identifiers (IRIs), http://www.ietf.org/rfc/rfc3987.txt , IETF, 2005. [RFC4880] Callas, J., Donnerhacke, L., Finney, H., Shaw, D., and R. Thayer, "OpenPGP Message Format", RFC 4880, DOI 10.17487/RFC4880, November 2007, < https://www.rfc-editor.org/info/rfc4880 >. [RFC683…

…e.g., Secure/Multipurpose Internet Mail Extensions (S/MIME) [RFC5751], OpenPGP [RFC4880]) in that: o the message signature is written as a message header field so that neither human recipients nor existing MUA (Mail User Agent) software is confused by signature-related content ap…

…tally signed using an OpenPGP cleartext signature as described in Section 7 of [RFC4880]. When digital signatures are used, it is also RECOMMENDED that organizations use the "Canonical" field (as per Section 2.5.2), thus allowing the digital signature to authenticate the location…

…payloads. In these situations, CMS [ RFC5652 ], S/MIME [ RFC5751 ] or OpenPGP [ RFC4880 ] could be used. In addition, there are many non-IETF protocols in this area. Like congestion control mechanisms, security mechanisms are difficult to design and implement correctly. It is hen…

…f individual users is message cryptography, such as Pretty Good Privacy (PGP) ([RFC4880]) or S/MIME ([RFC5751]). 11.5. Untrusted Information Sources An SPF-compliant receiver gathers information from the SMTP commands it receives and from the published DNS records of the sending …

… individual users is message cryptography, such as Pretty Good Privacy (PGP) ([ RFC4880 ]) or S/MIME ([ RFC5751 ]). 11.5 . Untrusted Information Sources An SPF-compliant receiver gathers information from the SMTP commands it receives and from the published DNS records of the send…

…., Secure/Multipurpose Internet Mail Extensions (S/MIME) [ RFC5751 ], OpenPGP [ RFC4880 ]) in that: o the message signature is written as a message header field so that neither human recipients nor existing MUA (Mail User Agent) software is confused by signature-related content a…

… address authentication or confidentiality (e.g., S/MIME [ RFC5751 ], OpenPGP [ RFC4880 ]). In cases where the confidentiality or authenticity of information contained in vCard is a concern, the vCard SHOULD be transported using one of these secure mechanisms. The KEY property ( …

…to address authentication or confidentiality (e.g., S/MIME RFC5751 ], OpenPGP [ RFC4880 ]). In cases where the confidentiality or authenticity of information contained in vCard is a concern, the vCard SHOULD be transported using one of these secure mechanisms. The KEY property ( …

…of such mechanisms include SMTP-TLS [ RFC3207 ], SMTP-Auth [ RFC4954 ], OpenPGP RFC4880 ], and S/MIME [ RFC3851 ]. The core of the Internet Mail architecture does not impose any security requirements or functions on the end-to-end or hop-by-hop components. For example, it does no…

…to address authentication or confidentiality (e.g., S/MIME RFC5751 ], OpenPGP [ RFC4880 ]). In cases where the confidentiality or authenticity of information contained in vCard is a concern, the vCard SHOULD be transported using one of these secure mechanisms. The KEY property ( …

…to address authentication or confidentiality (e.g., S/MIME RFC5751 ], OpenPGP [ RFC4880 ]). In cases where the confidentiality or authenticity of information contained in vCard is a concern, the vCard SHOULD be transported using one of these secure mechanisms. The KEY property ( …

…s MIME objects with authentication or privacy (e.g. S/MIME RFC5751 ], OpenPGP [ RFC4880 ]). In cases where the threat of "spoofed" vCard information is a concern, the vCard SHOULD BE transported using one of these secure mechanisms. o The information in a vCard may become out of …

… to address authentication or confidentiality (e.g., S/MIME [RFC5751], OpenPGP [RFC4880]). In cases where the confidentiality or authenticity of information contained in vCard is a concern, the vCard SHOULD be transported using one of these secure mechanisms. The KEY property (Se…