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Simple Mail Transfer Protocol
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==Further reading== * {{IETF RFC|1123}} β Requirements for Internet HostsβApplication and Support (STD 3) * {{IETF RFC|1870}} β SMTP Service Extension for Message Size Declaration (ΠΎbsoletes: {{IETF RFC|1653}}) * {{IETF RFC|2505}} β Anti-Spam Recommendations for SMTP MTAs (BCP 30) * {{IETF RFC|2821}} β Simple Mail Transfer Protocol * {{IETF RFC|2920}} β SMTP Service Extension for Command Pipelining (STD 60) * {{IETF RFC|3030}} β SMTP Service Extensions for Transmission of Large and Binary MIME Messages * {{IETF RFC|3207}} β SMTP Service Extension for Secure SMTP over Transport Layer Security (obsoletes {{IETF RFC|2487}}) * {{IETF RFC|3461}} β SMTP Service Extension for Delivery Status Notifications (obsoletes {{IETF RFC|1891}}) * {{IETF RFC|3463}} β Enhanced Status Codes for SMTP (obsoletes {{IETF RFC|1893}}, updated by {{IETF RFC|5248}}) * {{IETF RFC|3464}} β An Extensible Message Format for Delivery Status Notifications (obsoletes {{IETF RFC|1894}}) * {{IETF RFC|3798}} β Message Disposition Notification (updates {{IETF RFC|3461}}) * {{IETF RFC|3834}} β Recommendations for Automatic Responses to Electronic Mail * {{IETF RFC|3974}} β SMTP Operational Experience in Mixed IPv4/v6 Environments * {{IETF RFC|4952}} β Overview and Framework for Internationalized Email (updated by {{IETF RFC|5336}}) * {{IETF RFC|4954}} β SMTP Service Extension for Authentication (obsoletes {{IETF RFC|2554}}, updates {{IETF RFC|3463}}, updated by {{IETF RFC|5248}}) * {{IETF RFC|5068}} β Email Submission Operations: Access and Accountability Requirements (BCP 134) * {{IETF RFC|5248}} β A Registry for SMTP Enhanced Mail System Status Codes (BCP 138) (updates {{IETF RFC|3463}}) * {{IETF RFC|5321}} β The Simple Mail Transfer Protocol (obsoletes {{IETF RFC|821}} aka STD 10, {{IETF RFC|974}}, {{IETF RFC|1869}}, {{IETF RFC|2821}}, updates {{IETF RFC|1123}}) * {{IETF RFC|5322}} β Internet Message Format (obsoletes {{IETF RFC|822}} aka STD 11, and {{IETF RFC|2822}}) * {{IETF RFC|5504}} β Downgrading Mechanism for Email Address Internationalization * {{IETF RFC|6409}} β Message Submission for Mail (STD 72) (obsoletes {{IETF RFC|4409}}, {{IETF RFC|2476}}) * {{IETF RFC|6522}} β The Multipart/Report Content Type for the Reporting of Mail System Administrative Messages (obsoletes {{IETF RFC|3462}}, and in turn {{IETF RFC|1892}}) * {{IETF RFC|6531}} β SMTP Extension for Internationalized Email Addresses (updates {{IETF RFC|2821}}, {{IETF RFC|2822}}, {{IETF RFC|4952}}, and {{IETF RFC|5336}}) *{{IETF RFC|8314|}} β Cleartext Considered Obsolete: Use of Transport Layer Security (TLS) for Email Submission and Access
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