Simple Mail Transfer Protocol (English Wikipedia)

McKenzie, Alexander (2011). "INWG and the Conception of the Internet: An Eyewitness Account". IEEE Annals of the History of Computing. 33 (1): 66–71. Bibcode:2011IAHC...33a..66M. doi:10.1109/MAHC.2011.9. ISSN 1934-1547. S2CID 206443072.
Craig Partridge (2008), The Technical Development of Internet Email (PDF), IEEE Annals of the History of Computing, vol. 30, IEEE Computer Society, pp. 3–29, Bibcode:2008IAHC...30b...3P, doi:10.1109/MAHC.2008.32, S2CID 206442868, archived from the original (PDF) on May 12, 2011

apache.org (Global: 4,440^th place; English: 3,599^th place)

james.apache.org

James Server - ChangeLog Archived February 20, 2020, at the Wayback Machine. James.apache.org. Retrieved on 2013-07-17.

bbn.com (Global: low place; English: low place)

openmap.bbn.com

The First Network Email, Ray Tomlinson, BBN

ir.bbn.com

Craig Partridge (2008), The Technical Development of Internet Email (PDF), IEEE Annals of the History of Computing, vol. 30, IEEE Computer Society, pp. 3–29, Bibcode:2008IAHC...30b...3P, doi:10.1109/MAHC.2008.32, S2CID 206442868, archived from the original (PDF) on May 12, 2011

communigate.com (Global: low place; English: low place)

"Version 6.2 Revision History". CommuniGate.com. Archived from the original on October 29, 2020. Retrieved September 17, 2020.

doi.org (Global: 2^nd place; English: 2^nd place)

McKenzie, Alexander (2011). "INWG and the Conception of the Internet: An Eyewitness Account". IEEE Annals of the History of Computing. 33 (1): 66–71. Bibcode:2011IAHC...33a..66M. doi:10.1109/MAHC.2011.9. ISSN 1934-1547. S2CID 206443072.
Postel, J. (August 1982). Simple Mail Transfer Protocol (Report). RFC Editor. doi:10.17487/rfc0821.
Craig Partridge (2008), The Technical Development of Internet Email (PDF), IEEE Annals of the History of Computing, vol. 30, IEEE Computer Society, pp. 3–29, Bibcode:2008IAHC...30b...3P, doi:10.1109/MAHC.2008.32, S2CID 206442868, archived from the original (PDF) on May 12, 2011
J. Klensin (October 2008). Simple Mail Transfer Protocol. IETF Network Working Group. doi:10.17487/RFC5321. RFC 5321. Draft Standard. Updated by RFC 7504. Obsoletes RFC 2821. Updates RFC 1123.
Klensin, John C. (October 2008). "DATA Termination: 10 Minutes.". Simple Mail Transfer Protocol. IETF. sec. 4.5.3.2.6. doi:10.17487/RFC5321. RFC 5321. Retrieved June 7, 2010.
John Klensin; Ned Freed; Marshall T. Rose; Einar A. Stefferud; Dave Crocker (November 1995). SMTP Service Extensions. IETF. doi:10.17487/RFC1869. RFC 1869.
"The 8bit-MIMEtransport Service Extension". SMTP Service Extension for 8-bit MIME Transport. IETF. March 2011. sec. 3. doi:10.17487/RFC6152. RFC 6152.

freebsd.org (Global: 6,366^th place; English: 5,010^th place)

docs.freebsd.org

Eric Allman (1983), Sendmail – An Internetwork Mail Router (PDF), BSD UNIX documentation set, Berkeley: University of California, archived (PDF) from the original on May 20, 2013, retrieved June 29, 2012

github.com (Global: 380^th place; English: 337^th place)

"Halon MTA changelog". GitHub. November 9, 2021. Archived from the original on September 18, 2020. Retrieved September 17, 2020. v4.0: New SMTPUTF8 support Updated for new versions

hardenize.com (Global: low place; English: low place)

"Introducing MTA Strict Transport Security (MTA-STS) | Hardenize Blog". www.hardenize.com. Archived from the original on April 25, 2019. Retrieved April 25, 2019.

iana.org (Global: 2,479^th place; English: 2,606^th place)

"MAIL Parameters". IANA. February 14, 2020. Archived from the original on May 28, 2019. Retrieved May 28, 2019.
"SMTP Service Extension Parameters". IANA. Archived from the original on May 28, 2019. Retrieved November 5, 2013.

ietf.org (Global: 731^st place; English: 625^th place)

datatracker.ietf.org

J. Klensin (October 2008). Simple Mail Transfer Protocol. IETF Network Working Group. doi:10.17487/RFC5321. RFC 5321. Draft Standard. Updated by RFC 7504. Obsoletes RFC 2821. Updates RFC 1123.
Klensin, John C. (October 2008). "DATA Termination: 10 Minutes.". Simple Mail Transfer Protocol. IETF. sec. 4.5.3.2.6. doi:10.17487/RFC5321. RFC 5321. Retrieved June 7, 2010.
John Klensin; Ned Freed; Marshall T. Rose; Einar A. Stefferud; Dave Crocker (November 1995). SMTP Service Extensions. IETF. doi:10.17487/RFC1869. RFC 1869.
"The 8bit-MIMEtransport Service Extension". SMTP Service Extension for 8-bit MIME Transport. IETF. March 2011. sec. 3. doi:10.17487/RFC6152. RFC 6152.

tools.ietf.org

Barber, Stan O. (December 19, 2000). "draft-barber-uucp-project-conclusion-05 – The Conclusion of the UUCP Mapping Project". Archived from the original on October 13, 2007. Retrieved August 25, 2007.

ietf.org

Jiankang Yao (December 19, 2014). "Chinese email address". EAI (Mailing list). IETF. Archived from the original on October 2, 2015. Retrieved May 24, 2016.

imc.org (Global: low place; English: low place)

Paul Hoffman (February 1, 1998). "Allowing Relaying in SMTP: A Survey". Internet Mail Consortium. Archived from the original on March 5, 2016. Retrieved May 30, 2010.
Paul Hoffman (August 2002). "Allowing Relaying in SMTP: A Series of Surveys". Internet Mail Consortium. Archived from the original on January 18, 2007. Retrieved May 30, 2010.

iu.edu (Global: 3,497^th place; English: 2,025^th place)

kb.iu.edu

"In Unix, what is an open mail relay? - Knowledge Base". June 17, 2007. Archived from the original on June 17, 2007. Retrieved March 15, 2021.

kingsmtp.com (Global: low place; English: low place)

Picture of "The First Email Computer" by Dan Murphy, a PDP-10

microsoft.com (Global: 263^rd place; English: 259^th place)

multicians.org (Global: low place; English: low place)

The History of Electronic Mail Archived December 2, 2017, at the Wayback Machine, Tom Van Vleck: "It is not clear this protocol was ever implemented"

opost.com (Global: low place; English: low place)

Dan Murphy's TENEX and TOPS-20 Papers Archived November 18, 2007, at the Wayback Machine

oracle.com (Global: 2,532^nd place; English: 1,847^th place)

docs.oracle.com

"Communications Messaging Server Release Notes". oracle.com. October 2017. Archived from the original on November 24, 2020. Retrieved September 17, 2020.

pcworld.com (Global: 1,889^th place; English: 1,323^rd place)

Cara Garretson (2005). "ISPs Pitch In to Stop Spam". PC World. Archived from the original on August 28, 2015. Retrieved January 18, 2016. Last month, the Anti-Spam Technical Alliance, formed last year by Yahoo, America Online, EarthLink, and Microsoft, issued a list of antispam recommendations that includes filtering Port 25.

postfix.org (Global: low place; English: low place)

"Postfix SMTPUTF8 support is enabled by default" Archived August 7, 2020, at the Wayback Machine, February 8, 2015, postfix.org

prnewswire.com (Global: 546^th place; English: 310^th place)

Systems, Message. "Message Systems Introduces Latest Version Of Momentum With New API-Driven Capabilities". www.prnewswire.com (Press release). Archived from the original on July 19, 2020. Retrieved July 19, 2020.
"Message Systems Introduces Latest Version Of Momentum With New API-Driven Capabilities" (Press release). Archived from the original on September 15, 2020. Retrieved September 17, 2020.

rand.org (Global: 3,236^th place; English: 2,152^nd place)

Crocker, David H. (December 1977). "Framework and Functions of the "MS" Personal Message System" (PDF). The RAND Corporation. Archived (PDF) from the original on May 13, 2022. Retrieved April 17, 2022.

rfc-editor.org (Global: 747^th place; English: 325^th place)

RFC 524 – A Proposed Mail Protocol
RFC 469 – Network Mail Meeting Summary
IEN 85. IETF.
IEN 113. IETF.
"Internet Experiment Note Index". www.rfc-editor.org. Retrieved July 7, 2024.
The article about sender rewriting contains technical background info about the early SMTP history and source routing before RFC 1123.
RFC 5321 Section-7.2
J. Klensin (October 2008). Simple Mail Transfer Protocol. IETF Network Working Group. doi:10.17487/RFC5321. RFC 5321. Draft Standard. Updated by RFC 7504. Obsoletes RFC 2821. Updates RFC 1123.
RFC 1047
Klensin, John C. (October 2008). "DATA Termination: 10 Minutes.". Simple Mail Transfer Protocol. IETF. sec. 4.5.3.2.6. doi:10.17487/RFC5321. RFC 5321. Retrieved June 7, 2010.
John Klensin; Ned Freed; Marshall T. Rose; Einar A. Stefferud; Dave Crocker (November 1995). SMTP Service Extensions. IETF. doi:10.17487/RFC1869. RFC 1869.
Which was obsoleted in 2011 by RFC 6152 corresponding to the then new STD 71
"The 8bit-MIMEtransport Service Extension". SMTP Service Extension for 8-bit MIME Transport. IETF. March 2011. sec. 3. doi:10.17487/RFC6152. RFC 6152.

semanticscholar.org (Global: 15^th place; English: 8^th place)

api.semanticscholar.org

McKenzie, Alexander (2011). "INWG and the Conception of the Internet: An Eyewitness Account". IEEE Annals of the History of Computing. 33 (1): 66–71. Bibcode:2011IAHC...33a..66M. doi:10.1109/MAHC.2011.9. ISSN 1934-1547. S2CID 206443072.
Craig Partridge (2008), The Technical Development of Internet Email (PDF), IEEE Annals of the History of Computing, vol. 30, IEEE Computer Society, pp. 3–29, Bibcode:2008IAHC...30b...3P, doi:10.1109/MAHC.2008.32, S2CID 206442868, archived from the original (PDF) on May 12, 2011

sourceforge.net (Global: 1,842^nd place; English: 1,520^th place)

Sam Varshavchik (September 18, 2018). "New releases of Courier packages". courier-announce (Mailing list). Archived from the original on August 17, 2021. Retrieved September 17, 2020.

starttls-everywhere.org (Global: low place; English: low place)

"STARTTLS Everywhere". EFF. Archived from the original on August 9, 2019. Retrieved December 4, 2021.

support.google.com (Global: 2,836^th place; English: 2,952^nd place)

"Message Non Compliant with RFC 5322". Archived from the original on January 17, 2023. Retrieved January 20, 2021.

tldp.org (Global: low place; English: low place)

"Tldp.org". Archived from the original on August 17, 2007. Retrieved August 25, 2007.

uasg.tech (Global: low place; English: low place)

"EAI Readiness in TLDs" (PDF). February 12, 2019. Archived (PDF) from the original on January 24, 2021. Retrieved September 17, 2020.

washingtonpost.com (Global: 35^th place; English: 24^th place)

"A history of e-mail: Collaboration, innovation and the birth of a system". Washington Post. May 20, 2023. ISSN 0190-8286. Retrieved July 7, 2024.

web.archive.org (Global: 1^st place; English: 1^st place)

The History of Electronic Mail Archived December 2, 2017, at the Wayback Machine, Tom Van Vleck: "It is not clear this protocol was ever implemented"
Dan Murphy's TENEX and TOPS-20 Papers Archived November 18, 2007, at the Wayback Machine
Crocker, David H. (December 1977). "Framework and Functions of the "MS" Personal Message System" (PDF). The RAND Corporation. Archived (PDF) from the original on May 13, 2022. Retrieved April 17, 2022.
"Tldp.org". Archived from the original on August 17, 2007. Retrieved August 25, 2007.
Barber, Stan O. (December 19, 2000). "draft-barber-uucp-project-conclusion-05 – The Conclusion of the UUCP Mapping Project". Archived from the original on October 13, 2007. Retrieved August 25, 2007.
Eric Allman (1983), Sendmail – An Internetwork Mail Router (PDF), BSD UNIX documentation set, Berkeley: University of California, archived (PDF) from the original on May 20, 2013, retrieved June 29, 2012
Craig Partridge (2008), The Technical Development of Internet Email (PDF), IEEE Annals of the History of Computing, vol. 30, IEEE Computer Society, pp. 3–29, Bibcode:2008IAHC...30b...3P, doi:10.1109/MAHC.2008.32, S2CID 206442868, archived from the original (PDF) on May 12, 2011
Paul Hoffman (February 1, 1998). "Allowing Relaying in SMTP: A Survey". Internet Mail Consortium. Archived from the original on March 5, 2016. Retrieved May 30, 2010.
Paul Hoffman (August 2002). "Allowing Relaying in SMTP: A Series of Surveys". Internet Mail Consortium. Archived from the original on January 18, 2007. Retrieved May 30, 2010.
"In Unix, what is an open mail relay? - Knowledge Base". June 17, 2007. Archived from the original on June 17, 2007. Retrieved March 15, 2021.
"The MAIL, RCPT, and DATA verbs" Archived February 22, 2014, at the Wayback Machine, [D. J. Bernstein]
Systems, Message. "Message Systems Introduces Latest Version Of Momentum With New API-Driven Capabilities". www.prnewswire.com (Press release). Archived from the original on July 19, 2020. Retrieved July 19, 2020.
Cara Garretson (2005). "ISPs Pitch In to Stop Spam". PC World. Archived from the original on August 28, 2015. Retrieved January 18, 2016. Last month, the Anti-Spam Technical Alliance, formed last year by Yahoo, America Online, EarthLink, and Microsoft, issued a list of antispam recommendations that includes filtering Port 25.
"MAIL Parameters". IANA. February 14, 2020. Archived from the original on May 28, 2019. Retrieved May 28, 2019.
Jiankang Yao (December 19, 2014). "Chinese email address". EAI (Mailing list). IETF. Archived from the original on October 2, 2015. Retrieved May 24, 2016.
"SMTP Service Extension Parameters". IANA. Archived from the original on May 28, 2019. Retrieved November 5, 2013.
James Server - ChangeLog Archived February 20, 2020, at the Wayback Machine. James.apache.org. Retrieved on 2013-07-17.
The 8BITMIME extension Archived June 7, 2011, at the Wayback Machine. Cr.yp.to. Retrieved on 2013-07-17.
"Postfix SMTPUTF8 support is enabled by default" Archived August 7, 2020, at the Wayback Machine, February 8, 2015, postfix.org
"Message Systems Introduces Latest Version Of Momentum With New API-Driven Capabilities" (Press release). Archived from the original on September 15, 2020. Retrieved September 17, 2020.
"Version 6.2 Revision History". CommuniGate.com. Archived from the original on October 29, 2020. Retrieved September 17, 2020.
Sam Varshavchik (September 18, 2018). "New releases of Courier packages". courier-announce (Mailing list). Archived from the original on August 17, 2021. Retrieved September 17, 2020.
"Halon MTA changelog". GitHub. November 9, 2021. Archived from the original on September 18, 2020. Retrieved September 17, 2020. v4.0: New SMTPUTF8 support Updated for new versions
"MS-OXSMTP: Simple Mail Transfer Protocol (SMTP) Extensions". July 24, 2018. Archived from the original on August 16, 2021. Retrieved September 17, 2020.
"EAI Readiness in TLDs" (PDF). February 12, 2019. Archived (PDF) from the original on January 24, 2021. Retrieved September 17, 2020.
"Communications Messaging Server Release Notes". oracle.com. October 2017. Archived from the original on November 24, 2020. Retrieved September 17, 2020.
"Introducing MTA Strict Transport Security (MTA-STS) | Hardenize Blog". www.hardenize.com. Archived from the original on April 25, 2019. Retrieved April 25, 2019.
"STARTTLS Everywhere". EFF. Archived from the original on August 9, 2019. Retrieved December 4, 2021.
Cimpanu, Catalin. "Gmail becomes first major email provider to support MTA-STS and TLS Reporting". ZDNet. Archived from the original on April 29, 2019. Retrieved April 25, 2019.
"Message Non Compliant with RFC 5322". Archived from the original on January 17, 2023. Retrieved January 20, 2021.
"Message could not be delivered. Please ensure the message is RFC 5322 compliant". Archived from the original on January 28, 2021. Retrieved January 20, 2021.
"Why are the emails sent to Microsoft Account rejected for policy reasons?". Archived from the original on February 14, 2021. Retrieved January 20, 2021.

windows.net (Global: 1,494^th place; English: 1,128^th place)

interoperability.blob.core.windows.net

"MS-OXSMTP: Simple Mail Transfer Protocol (SMTP) Extensions". July 24, 2018. Archived from the original on August 16, 2021. Retrieved September 17, 2020.

worldcat.org (Global: 4^th place; English: 4^th place)

search.worldcat.org

"A history of e-mail: Collaboration, innovation and the birth of a system". Washington Post. May 20, 2023. ISSN 0190-8286. Retrieved July 7, 2024.
McKenzie, Alexander (2011). "INWG and the Conception of the Internet: An Eyewitness Account". IEEE Annals of the History of Computing. 33 (1): 66–71. Bibcode:2011IAHC...33a..66M. doi:10.1109/MAHC.2011.9. ISSN 1934-1547. S2CID 206443072.

yp.to (Global: low place; English: low place)

cr.yp.to

"The MAIL, RCPT, and DATA verbs" Archived February 22, 2014, at the Wayback Machine, [D. J. Bernstein]
The 8BITMIME extension Archived June 7, 2011, at the Wayback Machine. Cr.yp.to. Retrieved on 2013-07-17.

zdnet.com (Global: 1,235^th place; English: 855^th place)

Cimpanu, Catalin. "Gmail becomes first major email provider to support MTA-STS and TLS Reporting". ZDNet. Archived from the original on April 29, 2019. Retrieved April 25, 2019.

Simple Mail Transfer Protocol (English Wikipedia)

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ietf.org

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