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https://tools.ietf.org/html/rfc5321
RFC 5321 SMTP October 2008 1. Introduction 1.1. Transport of Electronic Mail The objective of the Simple Mail Transfer Protocol (SMTP) is to transfer mail reliably and efficiently. SMTP is independent of the particular transmission subsystem and requires only a reliable ordered data stream channel.
https://wordtothewise.com/2014/01/does-email-have-a-guarantee-of-delivery/
In both RFC 821/2 and RFC 2821/2 (the original email related RFCs and the update in the early 2000’s) the RFCs stated that once a receiving MTA accepted an email that that MTA was required to either delivery the mail or generate an asynchronous bounce.
https://support.microsoft.com/en-us/help/256321/enhanced-status-codes-for-delivery-rfc-1893
Apr 19, 2018 · Request for Comments (RFC) 1893 provides an enhanced set of status codes for Delivery Status Notification (DSN) messages. This is an extension of the coding defined in RFC 821.
https://datatracker.ietf.org/doc/rfc5321/
Although SMTP was designed as a mail transport and delivery protocol, this specification also contains information that is important to its use as a "mail submission" protocol for "split-UA" (User Agent) mail reading systems and mobile environments.
http://mail-server-test.online-domain-tools.com/
Our mail server health checker evaluates DNS SPF, MX, and PTR records, finds your mail servers and checks their availability and compliance with RFC standards and high delivery rate best practices. IPv6 mail servers are supported by this tool.
https://www.mailboxvalidator.com/resources/articles/acceptable-email-address-syntax-rfc/
Aug 21, 2017 · The syntax for an email address is familiar to most Internet users. There should be a local part followed by the @ symbol and then the domain part. In both the local and domain parts, there are specifications published online which determine what characters are acceptable for either one. There specifications are called Requests For Comments (RFC).
https://tools.ietf.org/html/rfc2822
This standard supersedes the one specified in Request For Comments (RFC) 822, "Standard for the Format of ARPA Internet Text Messages" , updating it to reflect current practice and incorporating incremental changes that were specified in other RFCs . This standard specifies a …
https://haacked.com/archive/2007/08/21/i-knew-how-to-validate-an-email-address-until-i.aspx/
Aug 21, 2007 · Apparently, distinction must be made if we consider characters that are permitted in email addresses as they appear in the fields of the header of an actual message (RFC 2822, formerly RFC 822) and in email addresses as they must be during the sending of a message with SMTP (RFC 2821, formerly RFC 821).
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