1. DANE for SMTP

1.1 Main IETF RFC

• RFC 7672 "SMTP Security via Opportunistic DNS-Based Authentication of Named Entities (DANE) Transport Layer Security (TLS)" (October 2015)

1.2 Other relevant IETF RFC's

• RFC 6698 "The DNS-Based Authentication of Named Entities (DANE), Transport Layer Security (TLS) Protocol: TLSA"
• RFC 7435 "Opportunistic Security: Some Protection Most of the Time"
• RFC 7671 "The DNS-Based Authentication of Named Entities (DANE) Protocol: Updates and Operational Guidance"
• RFC 8461 "SMTP MTA Strict Transport Security (MTA-STS)", more specifically par. 2 and 10.2

1.3 Community

• DANE users mailing list
• DANE IETF working group mailing list