References from draft-ietf-uta-smtp-require-tls

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Document Title Status Type Downref
BCP 138 A Registry for SMTP Enhanced Mail System Status Codes
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BCP 14 Key words for use in RFCs to Indicate Requirement Levels
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BCP 195 Recommendations for Secure Use of Transport Layer Security (TLS) and Datagram Transport Layer Security (DTLS)
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RFC 1939 Post Office Protocol - Version 3
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Internet Standard informatively references
RFC 2033 Local Mail Transfer Protocol
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RFC 2119 Key words for use in RFCs to Indicate Requirement Levels
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RFC 3207 SMTP Service Extension for Secure SMTP over Transport Layer Security
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RFC 3461 Simple Mail Transfer Protocol (SMTP) Service Extension for Delivery Status Notifications (DSNs)
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RFC 3501 INTERNET MESSAGE ACCESS PROTOCOL - VERSION 4rev1
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RFC 4033 DNS Security Introduction and Requirements
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RFC 4034 Resource Records for the DNS Security Extensions
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RFC 4035 Protocol Modifications for the DNS Security Extensions
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RFC 4880 OpenPGP Message Format
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RFC 5228 Sieve: An Email Filtering Language
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RFC 5234 Augmented BNF for Syntax Specifications: ABNF
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RFC 5248 A Registry for SMTP Enhanced Mail System Status Codes
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RFC 5321 Simple Mail Transfer Protocol
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RFC 5322 Internet Message Format
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RFC 5598 Internet Mail Architecture
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RFC 5751 Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 3.2 Message Specification
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RFC 6125 Representation and Verification of Domain-Based Application Service Identity within Internet Public Key Infrastructure Using X.509 (PKIX) Certificates in the Context of Transport Layer Security (TLS)
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RFC 6409 Message Submission for Mail
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RFC 7525 Recommendations for Secure Use of Transport Layer Security (TLS) and Datagram Transport Layer Security (DTLS)
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RFC 7672 SMTP Security via Opportunistic DNS-Based Authentication of Named Entities (DANE) Transport Layer Security (TLS)
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RFC 8174 Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words
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RFC 8314 Cleartext Considered Obsolete: Use of Transport Layer Security (TLS) for Email Submission and Access
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RFC 8461 SMTP MTA Strict Transport Security (MTA-STS)
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STD 53 Post Office Protocol - Version 3
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STD 68 Augmented BNF for Syntax Specifications: ABNF
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STD 72 Message Submission for Mail
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