…Access Servers and Mail Submission Servers, using DNS SRV records according to [RFC6186]. (In addition to making correct configuration easier for MUAs, this provides a way by which MUAs can discover when an MSP begins to offer TLS-based services.) Servers supporting TLS SHOULD be…

…ccess Servers and Mail Submission Servers, using DNS SRV records according to [ RFC6186 ]. (In addition to making correct configuration easier for MUAs, this provides a way by which MUAs can discover when an MSP begins to offer TLS-based services.) Servers supporting TLS SHOULD b…

…ssage User Agents (MUAs) and Message Submission Agents (MSAs) [ RFC6409 ]. In [ RFC6186 ], a protocol is specified that enables an MUA to dynamically locate the MSA based on the user's email address. SMTP connection security considerations for MUAs implementing [ RFC6186 ] are la…