RFC Knowledge Base

Comprehensive collection of Messaging Security RFCs with search and categorization

17 RFCs found

Authenticated Received Chain (ARC) Protocol

Defines ARC, a protocol that allows an intermediate mail handler to preserve email authentication results.

ARC Email Security Authentication Email
2019-07
RFC 8551
S/MIME
Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 4.0 Message Specification

Defines S/MIME version 4.0, providing encryption and digital signing capabilities for email messages.

S/MIME Encryption Email Security CMS Digital Signature
2019-04
The Authenticated Received Chain (ARC) Protocol

Earlier version of ARC protocol specification.

ARC Email Security Authentication Email
2019-04
SMTP Require TLS Option

Defines a mechanism for SMTP clients to require TLS encryption when connecting to mail servers.

SMTP TLS Encryption Email Security MTA
2018-09
Cleartext Considered Obsolete: Use of Transport Layer Security (TLS) for Email Submission and Access

Deprecates the use of cleartext protocols for email submission and access, recommending TLS instead.

TLS Email Security SMTP IMAP POP3
2018-01
SMTP Security via Opportunistic DNS-Based Authentication of Named Entities (DANE) Transport Layer Security (TLS)

Defines how to use DANE with SMTP to authenticate mail servers and prevent man-in-the-middle attacks.

SMTP TLS DANE DNS Email Security
2016-06
Domain-based Message Authentication, Reporting, and Conformance (DMARC)

Defines DMARC, a mechanism for email authentication that builds on SPF and DKIM to provide domain-level authentication and reporting.

DMARC Email Security Authentication DNS Email
2015-03
Sender Policy Framework (SPF) for Authorizing Use of Domains in Email, Version 1

Defines the SPF protocol for email authentication, allowing domain owners to specify which mail servers are authorized to send email on their behalf.

SPF Email Security Authentication DNS Email
2014-04
DomainKeys Identified Mail (DKIM) Signatures

Defines DKIM, a method for associating a domain name with an email message, allowing verification of the message's origin.

DKIM Email Security Authentication DNS Email
2011-09
STARTTLS and DANE in SMTP

Describes how to use STARTTLS with DANE (DNS-Based Authentication of Named Entities) for SMTP security.

SMTP TLS STARTTLS DANE DNS
2010-01
RFC 5598
Email Security
Internet Mail Architecture

Provides an overview of the Internet mail architecture, including components, protocols, and security considerations.

Email Architecture SMTP MTA MUA
2009-07
Simple Mail Transfer Protocol

Defines the SMTP protocol for sending and receiving email messages over the Internet.

SMTP Email MTA Protocol
2008-10
RFC 5322
Email Security
Internet Message Format

Defines the format of Internet messages, including headers, body, and MIME structure.

Email Message Format MIME Headers
2008-10
RFC 5280
Authentication
Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile

Defines the profile for X.509 certificates used in Internet applications, including email security.

Certificate X.509 PKI TLS S/MIME
2008-05
RFC 5084
S/MIME
Using AES-128-GCM and AES-256-GCM Authenticated Encryption in the Cryptographic Message Syntax (CMS)

Specifies the use of AES-GCM authenticated encryption algorithms in CMS for S/MIME, providing better security than traditional encryption methods.

S/MIME Encryption CMS Email Security AES
2007-11
SMTP Service Extension for Secure SMTP over Transport Layer Security

Defines STARTTLS extension for SMTP, allowing clients to upgrade a plaintext connection to TLS.

SMTP TLS STARTTLS Encryption Email Security
2002-02
RFC 2986
Authentication
PKCS #10: Certification Request Syntax Specification Version 1.7

Defines the syntax for certification requests used in certificate signing requests (CSR).

CSR Certificate PKCS TLS Encryption
2000-11
RFC 8617: Authenticated Received Chain (ARC) Protocol

Defines ARC, a protocol that allows an intermediate mail handler to preserve email authentication results.

ARC Email Security Authentication Email
Published: 2019-07
ARC
RFC 8551: Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 4.0 Message Specification

Defines S/MIME version 4.0, providing encryption and digital signing capabilities for email messages.

S/MIME Encryption Email Security CMS Digital Signature
Published: 2019-04
S/MIME
RFC 8550: The Authenticated Received Chain (ARC) Protocol

Earlier version of ARC protocol specification.

ARC Email Security Authentication Email
Published: 2019-04
ARC
RFC 8460: SMTP Require TLS Option

Defines a mechanism for SMTP clients to require TLS encryption when connecting to mail servers.

SMTP TLS Encryption Email Security MTA
Published: 2018-09
TLS
RFC 8314: Cleartext Considered Obsolete: Use of Transport Layer Security (TLS) for Email Submission and Access

Deprecates the use of cleartext protocols for email submission and access, recommending TLS instead.

TLS Email Security SMTP IMAP POP3 Encryption
Published: 2018-01
TLS
RFC 7672: SMTP Security via Opportunistic DNS-Based Authentication of Named Entities (DANE) Transport Layer Security (TLS)

Defines how to use DANE with SMTP to authenticate mail servers and prevent man-in-the-middle attacks.

SMTP TLS DANE DNS Email Security Authentication
Published: 2016-06
TLS
RFC 7489: Domain-based Message Authentication, Reporting, and Conformance (DMARC)

Defines DMARC, a mechanism for email authentication that builds on SPF and DKIM to provide domain-level authentication and reporting.

DMARC Email Security Authentication DNS Email SPF DKIM
Published: 2015-03
DMARC
RFC 7208: Sender Policy Framework (SPF) for Authorizing Use of Domains in Email, Version 1

Defines the SPF protocol for email authentication, allowing domain owners to specify which mail servers are authorized to send email on their behalf.

SPF Email Security Authentication DNS Email
Published: 2014-04
SPF
RFC 6376: DomainKeys Identified Mail (DKIM) Signatures

Defines DKIM, a method for associating a domain name with an email message, allowing verification of the message's origin.

DKIM Email Security Authentication DNS Email Cryptographic
Published: 2011-09
DKIM
RFC 5750: STARTTLS and DANE in SMTP

Describes how to use STARTTLS with DANE (DNS-Based Authentication of Named Entities) for SMTP security.

SMTP TLS STARTTLS DANE DNS Email Security
Published: 2010-01
TLS
RFC 5598: Internet Mail Architecture

Provides an overview of the Internet mail architecture, including components, protocols, and security considerations.

Email Architecture SMTP MTA MUA Email Security
Published: 2009-07
Email Security
RFC 5321: Simple Mail Transfer Protocol

Defines the SMTP protocol for sending and receiving email messages over the Internet.

SMTP Email MTA Protocol
Published: 2008-10
SMTP
RFC 5322: Internet Message Format

Defines the format of Internet messages, including headers, body, and MIME structure.

Email Message Format MIME Headers
Published: 2008-10
Email Security
RFC 5280: Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile

Defines the profile for X.509 certificates used in Internet applications, including email security.

Certificate X.509 PKI TLS S/MIME Email Security
Published: 2008-05
Authentication
RFC 5084: Using AES-128-GCM and AES-256-GCM Authenticated Encryption in the Cryptographic Message Syntax (CMS)

Specifies the use of AES-GCM authenticated encryption algorithms in CMS for S/MIME, providing better security than traditional encryption methods.

S/MIME Encryption CMS Email Security AES GCM AEAD
Published: 2007-11
S/MIME
RFC 3207: SMTP Service Extension for Secure SMTP over Transport Layer Security

Defines STARTTLS extension for SMTP, allowing clients to upgrade a plaintext connection to TLS.

SMTP TLS STARTTLS Encryption Email Security
Published: 2002-02
TLS
RFC 2986: PKCS #10: Certification Request Syntax Specification Version 1.7

Defines the syntax for certification requests used in certificate signing requests (CSR).

CSR Certificate PKCS TLS Encryption
Published: 2000-11
Authentication

No RFCs found

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