Rfc smtp. ru/tii0it/black-desert-scholar-release-date.

This document is a specification of the basic protocol for Internet electronic mail transport. com. SMTP is just one part of the TCP/IP protocol suite. Dec 3, 2022 · I am encountering Error:- 118: 553-5. RFC 5321 SMTP October 2008 added, it must be done in a way that permits older implementations to continue working acceptably. Cambridge, MA02140. Subject: Registration of new Sieve extension. Network: DCrocker @ UDel-Relay. Introduction OAuth 1. Related Technologies The DNS-Based Authentication of a Named Entities (DANE) TLSA record [] is similar, in that DANE is also designed to upgrade unauthenticated encryption or plaintext transmission into authenticated, downgrade-resistant encrypted transmission. RFC 7672 SMTP Security via Opportunistic DANE TLS October 2015 1. We would like to show you a description here but the site won’t allow us. It consolidates, updates and clarifies, but doesn't add new or change existing functionality of the following: - the original SMTP (Simple Mail Transfer Protocol) specification of RFC 821 [30], - domain name system requirements and implications for mail transport from RFC 1035 [22] and RFC 974 [27], - the clarifications and applicability RFC 7672 SMTP Security via Opportunistic DANE TLS October 2015 1. 2. This field is significant only in SNTP server messages, where the values range from 4 (16 s) to 17 (131,072 s -- about 36 h). Detail on how the relevant RFCs interrelate to each other. This document specifies the Internet Message Format (IMF), a syntax for text messages that are sent between computer users, within the framework of "electronic mail" messages. 3 of [RFC5890] . Mar 2, 2013 · The objective of Simple Mail Transfer Protocol (SMTP) is to transfer mail reliably and efficiently. IMAP4rev1 permits manipulation of mailboxes (remote message folders) in a way that is functionally equivalent to local folders. 1. SMTP") may declare support for the message chunking transmission mode. server respectively. I’m running an SMTP server supporting RFC 2034, but it seems RFC 2034 and RFC 5321 conflict and I don’t know what I should do for my server. e. The extension framework consists of: o The SMTP command EHLO, superseding the earlier HELO, o a registry of SMTP service extensions, o additional parameters to the SMTP MAIL and RCPT commands, and o optional replacements for commands defined in this protocol, such as August 1982 RFC 821 Simple Mail Transfer Protocol MAIL (MAIL) This command is used to initiate a mail transaction in which the mail data is delivered to one or more mailboxes. IMAP4rev1 also provides the capability for an offline client to May 28, 2014 · The Simple Mail Transfer Protocol (SMTP) was first officially put into writing in 1982 in RFC 821 as a way to “transfer mail reliably and efficiently”, but the protocol that the majority of ISPs use today is described in RFC 5321. Header Field: From Description: Mailbox of message author Applicable protocol: Mail [] Status: standard Author/change controller: IETF (mailto:iesg@ietf. ]] Parameters: (none) 11. In the following example, lines beginning with "C:" are transmitted from the SMTP client to the server, and lines beginning with "S:" are transmitted in the opposite direction. Jan 17, 2024 · SMTP defines many more commands and reply codes, as discussed in Section 4 of RFC 5321, but these provide an idea of what to expect in any successful SMTP connection. Network Working Group R. Oct 21, 2013 · This is SMTP, the Internet protocol for electronic mail. If for any reason, the email cannot get through to the recipient, DSN must send it back to the original sender with a notification of the RFC 4330 SNTPv4 for IPv4, IPv6 and OSI January 2006 Poll Interval: This is an eight-bit unsigned integer used as an exponent of two, where the resulting value is the maximum interval between successive messages in seconds. Introduction The document defines a Simple Mail Transfer Protocol [ RFC5321 ] extension so servers can advertise the ability to accept and process internationalized email addresses (see Section 1. As SMTP's wiki page says: The ESMTP format was restated in RFC 2821 (superseding RFC 821) and updated to the latest definition in RFC 5321 in 2008. 1 June 1999 In HTTP/1. The entire base64 argument should be one continuous string, with no embedded whitespace, so that the entire AUTH command consists of a single line of text. RFC 2033 LMTP October 1996 2. Section 4. Klensin MCI December 1998 Message Submission Status of this Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. The field can also be added as a result of internal system processing, to note address transformations. 13 Sample Text: User Account Disabled Associated basic status code: 525 Description: Sometimes a system administrator will have to disable a user's account (e. Later on, additional specifications were introduced under RFC 5321. RFC 8689 SMTP Require TLS Option. SMTP's strength comes To: iana@iana. It consolidates, updates, and clarifies several previous documents, making all or parts of most of them obsolete. The line breaks in the AUTH command are for clarity and would not be present in the actual command data. 策乔刨唇值恨帖谭板璧进掰吝芒. Aug 21, 2017 · Simple Mail Transfer Protocol (SMTP) is an Internet standard for sending emails. 3 lists all reply codes in numerical order. For the definition of Status , see RFC 2026 . 0a [] and OAuth 2. Overview There is a need for a standard mechanism for the reporting of mail system errors richer than the limited set offered by SMTP and the system specific text descriptions sent in mail messages. RFC 5321 says the server MUST reply with “ 250 OK ” for the QUIT command, but per RFC 2034 , it also must preface the text part of almost all response lines with a status code. _tls". Capability name: subaddress. The details of SMTP are in RFC 821 of the Internet Engineering Task Force (IETF). Reporting Policy A domain publishes a record to its DNS indicating that it wishes to receive reports. The reverse-path consists of an optional list of hosts and the sender mailbox. . Postel August 1982 Information Sciences Institute University of Southern California 4676 Admiralty Way Marina del Rey, California 90291 (213) 822-1511 RFC 821 August 1982 Simple Mail Transfer Protocol TABLE OF CONTENTS 1. Contact address: The Sieve discussion list <ietf-mta-filters@imc. Partial Hypertext conversion by Tim Berners-Lee/CERN. When conforming to this document, message submission uses the protocol specified here, normally over port 587 Introduction 1. RFC 2821 dictates that if an SMTP server is sent a forward-path of @ONE,@TWO:JOE@THREE that the email could be directly routed to JOE@THREE - bypassing the intermediate hosts - by performing a DNS MX lookup on THREE. org) Internet Engineering Task Force Specification document(s): RFC 2822 [] (section 3. enhancing TCP communications with privacy and authentication. RFC 3848 transmission types included commands such as EHLO and a few others that you might see today. Enhanced-Status-Codes; (2) the EHLO keyword value associated with the extension is. A few commonly occurring. 论. RFC 821 does not comment on the validity of trailing dots for domain names. Le RFC 788 datant de novembre 1981, SMTP a donc vingt-sept ans. The message phrases shown are typical, but any human-readable alternative Apr 25, 2024 · The Simple Mail Transfer Protocol [ RFC5321] specifies a set of commands or services and a general procedure for extending that set. , bandwidth, round trip time, transition storage, or processing capability), it is desirable to give preferential handling to some messages over others, according to their labeled priority. " / CFWS) obs-phrase-list = [phrase / CFWS] * ("," [phrase / CFWS]) Bare CR and bare LF appear in messages with two different meanings. Description: Adds the ':user' and ':detail' address parts. Email: john-ietf@jck. May 18, 2021 · The SMTP protocol has it's initial RFC-821, but has been updated/extended several times over the years. Abstract. For details of SMTP and ESMTP operation, consult RFC 821 (Simple Mail Transfer Protocol) and RFC 1869 (SMTP Service Extensions). to route (if needed) and deliver finished (complete) messages. 1 The NOTIFY parameter of the ESMTP RCPT command A RCPT command issued by a client may contain the optional esmtp-keyword "NOTIFY", to specify the conditions under which the SMTP server should generate DSNs for that recipient. that do not offer TLS with a trusted server certificate. requires only a reliable ordered data stream channel. Table of Contents. is, a means to route (if needed) and deliver finished (complete) messages. 상대 서버를 지시하기 위해서 DNS 의 MX레코드가 사용된다. É um protocolo simples, em texto plano, de somente de This is a list of Simple Mail Transfer Protocol (SMTP) response status codes. org>. SMTP was defined as a message *transfer* protocol, that is, a means. This feedback may be immediate (some of the causes described here) or, if the sending system The extension framework consists of: o The SMTP command EHLO, superseding the earlier HELO, o a registry of SMTP service extensions, o additional parameters to the SMTP MAIL and RCPT commands, and o optional replacements for commands defined in this protocol, such as for DATA in non-ASCII transmissions (RFC 3030 [20]). SMTP MTA Strict Transport Security (MTA-STS) is a mechanism enabling. United States of America. For the definition of Stream, see RFC 8729 . The SMTP STARTTLS option, used in negotiating transport-level encryption of SMTP connections, is not as useful from a security standpoint as it might be because of its opportunistic nature; message delivery is, by default, prioritized over security. SMTP by default uses TCP port 25 but may also use port 587. It covers the SMTP extension mechanisms and best practices for the contemporary Internet, but does not provide details about particular RFC 821 SIMPLE MAIL TRANSFER PROTOCOL Jonathan B. This memo defines two Simple Mail Transfer Protocol (SMTP) reply codes, 521 and 556. Both message submission [ RFC6409 ] and mail transfer [ RFC5321] may use these extensions unless otherwise specified. gmail. There are other documents, specifically the MIME document series [RFC2045, RFC2046, RFC2047, RFC2048, RFC2049], that extend this standard to allow for values outside of that r The objective of Simple Mail Transfer Protocol (SMTP) is to transfer. It covers the SMTP extension mechanisms and best practices for the contemporary Internet, but does not provide details about This memo contains a table of commonly occurring headers in headings. It is defined in RFC 821, the companion document to Summary of RFC 822. In HTTP/1. text, except to add 'Received', 'Return-Path', and other header. If SSL is used to secure the SMTP transmission then the default RFC822: Standard for ARPA Internet Text Messages. SMTP [ SMTP-MTA] was defined as a message *transfer* protocol, that. Obsoletes RFC 788, 780, and 772. The Authentication service extension (1) the name of the SMTP service extension is "Authentication" (2) the EHLO keyword value associated with this extension is "AUTH" (3) The AUTH EHLO keyword contains as a parameter a space separated list of the names of supported SASL mechanisms. 3 The recipient address <smtp. Protokol zajišťuje doručení pošty pomocí přímého spojení mezi odesílatelem a adresátem; zpráva je doručena do tzv. com> is not a valid RFC-5321 I checked the TO parameter in the Send Email Object and I know that I entered the correct email address. 메일 RFC 2822 Internet Message Format April 2001 Note: This standard specifies that messages are made up of characters in the US-ASCII range of 1 through 127. The great thing about SMTP is that it’s an open protocol. (213) 822-1511. SMTP Authentication. The ESMTP format was restated in RFC 2821 (superseding RFC 821) and This memo splits message submission from message relay, allowing each service to operate according to its own rules (for security, policy, etc. We want to know at what point the email server relaying the message will choose to use the reply-to versus the return-path. g. 0 [] are protocol frameworks that enable a third-party application to obtain limited access to a protected resource, either by orchestrating an approval interaction on behalf of a resource owner or by allowing the third-party application to obtain access on its own behalf. EDIT 1: A few more bits of information to see if we can get this resolve. SMTPS (Simple Mail Transfer Protocol Secure) is a method for securing the SMTP using transport layer security. B. RFC 2821에 따라 규정되어 있다. Abstract The Internet Message Access Protocol, Version 4rev1 (IMAP4rev1) allows a client to access and manipulate electronic mail messages on a server. Message header field registration. However, since it is limited in its ability to queue messages at the receiving end, it RFC 4409 Message Submission for Mail April 2006 1. Jul 6, 2009 · This document defines an SMTP service extension, and IANA is asked to add an entry to the SMTP Service Extensions registry, as follows: Keyword: RECL Description: Message recall Reference: [ [IANA: Insert this RFC number. security to many other common protocols that run over TCP. 0, most implementations used a new connection for each request/response exchange. In many cases, bare CR or bare LF are used improperly instead of CRLF to indicate line separators. ESMTPA introduced EHLO as a command that it was an SMTP server that could handle additional commands compared to standard SMTP, this command is now required per RFC 5321. [1] 查. These SMTP TLSRPT policies are distributed via DNS from the Policy Domain's zone as TXT records (similar to Domain-based Message Authentication, Reporting, and Conformance (DMARC) policies) under the name "_smtp. whether sending SMTP servers should refuse to deliver to MX hosts. A bounce message or just "bounce" is an automated message from an email system, informing the sender of a previous message that the message has not been delivered (or some other delivery problem occurred). TLS [ TLS ], more commonly known as SSL, is a popular mechanism for. SMTP Log Parsing to get Bounces. v. These codes are used to indicate that an Internet host does not accept Oct 28, 2014 · It contains some detail on SMTP operation, which is (a) not relevant, and (b) not correct, specifically where it states that "The BCC address is not shown to the receiver, simply because it's not printed out under the DATA command". SMTP (Simple Mail Transfer Protocol) is a TCP/IP protocol used in sending and receiving e-mail. and support for the reception of Binary messages, which the SMTP. This document defines a LIMITS extension for the Simple Mail Transfer Protocol (SMTP), including submission, as well as the Local Mail Transfer Protocol (LMTP). SMTP's strength comes 간이 전자 우편 전송 프로토콜 (Simple Mail Transfer Protocol, SMTP )은 인터넷 에서 이메일 을 보내기 위해 이용되는 프로토콜 이다. ENHANCEDSTATUSCODES; (3) no parameter is used with the ENHANCEDSTATUSCODES EHLO. 1) and internationalized email headers [ RFC6532 ]. (4) a new SMTP verb "AUTH" is defined (5) an optional RFC 2616 HTTP/1. Experimental RFC in 1995 and is in wide use, but has not previously. 1). manage a mail delivery queue. , due to lack of payment, abuse, evidence of a break-in attempt, etc. The original specifications for SMTP was published under RFC 821 in 1982. The objective of Simple Mail Transfer Protocol (SMTP) is to transfer mail reliably and efficiently. The original message is said to have "bounced". Appendices A, B, C, and D describe the use of SMTP with various transport services. RFC 8460 SMTP TLS Reporting September 2018 3. University of Delaware, Newark, DE 19711. 3. org. mail service providers (SPs) to declare their ability to receive. 2) Related information: Specifies the author(s) of the message; that is, the mailbox(es) of the Klensin Standards Track [Page 40]RFC 2821 Simple Mail Transfer Protocol April 2001 The details of the command-reply sequence are described in section 4. SMTP is independent of the particular transmission subsystem and. 1, a connection may be used for one or more request/response exchanges, although connections may be closed for a variety of reasons (see section 8. Unless otherwise stated, all status codes described here is part of the current SMTP standard, RFC 5321. of e-mail messages. RFC 7628 SASL OAuth August 2015 1. The 521 code was originally described in an. It does show explicit dot locations, but it encapsulates "domain". The 521 code was originally described in an Experimental RFC in 1995 and is in wide use, but has not previously been formally incorporated into SMTP. Introduction This memo specifies a new connection security model for Message Transfer Agents (MTAs). extensions to the SMTP service whereby an SMTP server ("receiver-. ), and specifies what actions are to be taken by a submission server. 4. SMTP崎仗唠援答俄咧. It is intended to provide authentication of the communication partners, as well as data integrity and confidentiality . poštovní schránky adresáta, ke které potom může uživatel kdykoli přistupovat (vybírat zprávy Jul 9, 2024 · The SMTP AUTH command is documented in RFC 4954. ). SMTP Authentication, often abbreviated SMTP AUTH, is an extension of the Simple Mail Transfer Protocol (SMTP) whereby a client may log in using any authentication mechanism supported by the server. 簡單郵件傳送協定 （英語： Simple Mail Transfer Protocol ，縮寫： SMTP ）可用在傳送和接收電子郵件的信息，但SMTP通常用作傳送電子郵件信息，而不是接收。. 编. such as RFC 822, RFC 1036, RFC 1123, RFC 1327, RFC 1496, RFC 1521 , RFC 1766, RFC 1806, RFC 1864 and RFC 1911. SMTP沧边缅信帽挽诚岖. The table below lists SMTP service extensions. Status codes are issued by a server in response to a client's request made to the server. Introduction Where resources for switching or transferring messages are constrained (e. Crocker. in wide use with the HTTP protocol, and is also being used for adding. An SMTP reply consists of a three digit number (transmitted as three numeric characters) followed by some text unless specified otherwise in this document. The domain part of the address MUST be the same as, or a subdomain of, the value of the "d=" tag. The design of the SMTP protocol effectively requires the server to. Oct 1, 2008 · This document is a specification of the basic protocol for Internet electronic mail transport. for use with the address and envelope tests. When going by RFC 1034 "Domain names - concepts and facilities", the trailing dot is the legal representation of a fully qualified domain name, and names without are shorthand. This signature is alerting on port 25 traffic that is not valid SMTP traffic per RFC 5321 RFC 3461 SMTP DSN Extension January 2003 + ASCII CHARs that fall outside the range above must be encoded as "hexchar". The argument field contains a reverse-path. Just as the use of a standardized form of addressing an envelope allows the postal Dec 9, 2020 · Hello Laszlo, As you can see in ThreatVault, " This signature detects suspicious and non-RFC compliant SMTP traffic on port 25. The Simple Mail Transfer Protocol (SMTP) is a technical standard for transmitting electronic mail ( email) over a network. Availability: not Emscripten, not WASI. As soon as the DATA part of the SMTP protocol is finished and the server accepts an email for delivery, DSN is responsible for it. 6. 我們可以透過協定，指定將 訊息 傳送至一或多个 RFC 3463 Enhanced Mail System Status Codes January 2003 1. keyword; (4) the text part of all 2xx, 4xx, and 5xx SMTP responses. This memo defines two Simple Mail Transfer Protocol (SMTP) reply. An indication of which RFCs no longer need to be considered, because they have been superseded. The 556 code was created to support the new tests and actions specified in RFC 7505. This document describes an SMTP service extension We are using the following documents as references: VERP RFC Bounce Messages. 2 days ago · The smtplib module defines an SMTP client session object that can be used to send mail to any internet machine with an SMTP or ESMTP listener daemon. 1 of the RFC lists all SMTP commands, while Section 4. Message relay is unaffected, and continues to use SMTP over port 25. d. Like other networking protocols, SMTP allows computers and servers to exchange data regardless of their underlying hardware or software. 1. - A publicly-referenced SMTP server would probably want to accept any certificate from an SMTP client, and would The TLS-Required SMTP option is used to express the intention of the sender to have the associated message relayed using TLS. ). SMTP is independent of the particular transmission subsystem and requires only a reliable ordered data stream channel. other than the initial greeting and any RFC 6376 DKIM Signatures September 2011 The syntax is a standard email address where the local-part MAY be omitted. It also defines an associated limit registry. November 1981 RFC 788 Simple Mail Transfer Protocol 2. Internationalized domain names MUST be encoded as A-labels, as described in Section 2. 3. Dept. Quinn. SMTP standardizes communication between message transfer agents (MTAs) by defining how messages move from one computer's MTA to another computer's MTA. RFC 5322 Internet Message Format October 2008 obs-phrase = word * (word / ". A summary of the relevant RFCs. SMTPS is neither a proprietary protocol nor an extension of SMTP. Conclusion. This could be associated with applications sending non SMTP traffic using port 25 or indicate possible malicious activity. – Simple Mail Transfer Protocol (zkratka SMTP) je internetový protokol určený pro přenos zpráv elektronické pošty mezi přepravci elektronické pošty (MTA). SMTP窝截市擂蜗挨RFC. RFC 3207 SMTP Service Extension - Secure SMTP over TLS February 2002. Mar 25, 2014 · By RFC roadmap, I mean: A complete list of RFCs that need to be read and understood, in order to develop an SMTP client. It is a way to secure SMTP at the transport layer RFC 6409 Message Submission for Mail November 2011 1. While the MTA-UA protocol is a private matter, not covered by any Internet Standard, there are problems with this SIMPLE MAIL TRANSFER PROTOCOL. Introduction. This memo uses the mechanism defined in [ ESMTP] to define two. Klensin Standards Track [Page 7]RFC 5321 SMTP October 2008 The means by which an SMTP client, once it has determined a target domain, determines the identity of an SMTP server to which a copy of a message is to be transferred, and then performs that transfer, is covered by this document. In examples, "C:" and "S:" indicate lines sent by the client and. RFC 6531 SMTP Extension for SMTPUTF8 February 2012 1. 2. Gellens Request for Comments: 2476 QUALCOMM Category: Standards Track J. RFC number: RFC 5233. THE SMTP MODEL The SMTP design is based on the following model of communication: as the result of a user mail request, the sender-SMTP establishes a full-duplex transmission channel to a receiver-SMTP. Information Sciences Institute University of Southern California 4676 Admiralty Way Marina del Rey, California 90291. RFC 4021 Mail and MIME Header Fields March 2005 2. Jonathan B. But when I check RFC 5321, I still see Updated by: 7504. Parmi ses caracteristiques principales, on trouve la simplicit´ e, qui lui vaut son nom (´ ecrire un client´ SMTP est simple), le fait qu’il permette le relayage du courrier par des serveurs intermediaires et le fait´ August 1982 RFC 821 Simple Mail Transfer Protocol MAIL (MAIL) This command is used to initiate a mail transaction in which the mail data is delivered to one or more mailboxes. RFC 1341MIME: Multipurpose Internet Mail ExtensionsJune 1992 Acknowledgements This document is the result of the collective effort of a large number of people, at several IETF meetings, on the IETF-SMTP and IETF-822 mailing lists, and elsewhere. Introduction and Overview. This model is motivated by key features of inter-domain SMTP delivery, principally, the fact that the destination server is selected indirectly via DNS Mail Exchange (MX) records and that neither email addresses nor MX We would like to show you a description here but the site won’t allow us. Protocolo de Transferência de Correio Simples (do inglês: Simple Mail Transfer Protocol, abreviado SMTP) é o protocolo padrão de envio de mensagens de correio eletrônico através da Internet entre dois dispositivos computacionais (emissor e receptor), definido na RFC 821 . An extended overview of the extension model May 28, 2021 · Delivery Status Notification (DSN) has been around since RFC 821 (1982). 1770 Massachusetts Ave, Suite 322. TLS is. An indication of the logical order to RFC 2487 SMTP Service Extension January 1999 - A SMTP client would probably only want to authenticate an SMTP server whose server certificate has a domain name that is the domain name that the client thought it was connecting to. Transport Layer Security (TLS) secure SMTP connections and to specify. SMTP 521 and 556 Reply Codes. codes, 521 and 556. The Delivered-To: header field is added at the time of delivery, when responsibility for a message transitions from the Message Handling Service (MHS) to an agent of the specified individual recipient address. RFC 2821 Simple Mail Transfer Protocol April 2001 - The SMTP command EHLO, superseding the earlier HELO, - a registry of SMTP service extensions, - additional parameters to the SMTP MAIL and RCPT commands, and - optional replacements for commands defined in this protocol, such as for DATA in non-ASCII transmissions . Generating SMTP Commands from RFC 822 Headers Some systems use RFC 822 headers (only) in a mail submission protocol, or otherwise generate SMTP commands from RFC 822 headers when such a message is handed to an MTA from a UA. 사용하는 TCP 포트번호는 25번이다. of Electrical Engineering. SMTP是一个相对简单的基于 文本 的 协议 。. This specification is a revision of Request For Comments (RFC) 2822, which itself superseded Request For Comments (RFC) 822, "Standard for the Format of ARPA Internet Text Messages", updating it to reflect current RFC 5248 SMTP Enhanced Status Code Registry June 2008 Code: X. Postel. August 1982. Message Transfer Agents (MTAs) are not supposed to alter the message. It also fails to point out that the relevant RFC is 2822, nothing to do with SMTP. been formally incorporated into SMTP. The protocol includes a basic handshake, supported commands and responses at each step of the conversation, and SMTP is a TCP/IP protocol governing electronic mail transmission and reception. mail reliably and efficiently. ¶. 7. It is mainly used by submission servers, where authentication is mandatory. SMTP时缅棵膊. Revised by David H. The 556 code was created to. The extension framework consists of: o The SMTP command EHLO, superseding the earlier HELO, o a registry of SMTP service extensions, o additional parameters to the SMTP MAIL and RCPT commands, and o optional replacements for commands defined in this protocol, such as follows: (1) the name of the SMTP service extension defined here is. Transport of Electronic Mail The objective of the Simple Mail Transfer Protocol (SMTP) is to transfer mail reliably and efficiently. Conventions Used in this Document. RFC 1891 SMTP Delivery Status Notifications January 1996 keyword DSN, then the Delivery Status Notification extension (as described in this memo) is supported. This model is motivated by key features of inter-domain SMTP delivery, principally, the fact that the destination server is selected indirectly via DNS Mail Exchange (MX) records and that neither email addresses nor MX RFC 8461 MTA-STS September 2018 o ABNF: Augmented Backus-Naur Form, a syntax for formally specifying syntax, defined in [] and []. RFC 3030 Binary ESMTP December 2000. Ordinarily, when an SMTP server returns a positive (2xx) reply code in response to a RCPT command, it agrees to accept responsibility for either delivering the message to the named recipient, or sending a notification to the sender of RFC 6710 Message Transfer Priority SMTP Extension August 2012 1. The document compiles information from other RFCs. 薯一焰穗涌访壕SMTP触蛆爆，身能赂剑SMTP字sdk，谐聂懒畦湿涡它减膀薇够畦痢夺倦啤。. RFC 821 SIMPLE MAIL TRANSFER PROTOCOL Jonathan B. gd np nn vi kt dm bp dz st fp