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Email address

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EAI enables users to have a localized address in a native language script or character set, as well as an ASCII form for communicating with legacy systems or for script-independent use. Applications that recognize internationalized domain names and mail addresses must have facilities to convert these
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Formal and informal standards: RFC 3696 provides specific advice for validating Internet identifiers, including email addresses. Some websites instead attempt to evaluate the validity of email addresses through arbitrary standards, such as by rejecting addresses containing valid characters, such as
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Sender reputation: An email sender's reputation may be used to attempt to verify whether the sender is trustworthy or a potential spammer. Factors that may be incorporated into an assessment of sender reputation include the quality of past contact with or content provided by, and engagement levels
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Verification links: Email address validation is often accomplished for account creation on websites by sending an email to the user-provided email address with a special temporary hyperlink. On receipt, the user opens the link, immediately activating the account. Email addresses are also useful as
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A local-part is either a Dot-string or a Quoted-string; it cannot be a combination. Quoted strings and characters, however, are not commonly used. RFC 5321 also warns that "a host that expects to receive mail SHOULD avoid defining mailboxes where the Local-part requires (or uses) the Quoted-string
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If quoted, it may contain Space, Horizontal Tab (HT), any ASCII graphic except Backslash and Quote and a quoted-pair consisting of a Backslash followed by HT, Space or any ASCII graphic; it may also be split between lines anywhere that HT or Space appears. In contrast to unquoted local-parts, the
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The local-part of an email address has no significance for intermediate mail relay systems other than the final mailbox host. Email senders and intermediate relay systems must not assume it to be case-insensitive, since the final mailbox host may or may not treat it as such. A single mailbox may
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The basic EAI concepts involve exchanging mail in UTF-8. Though the original proposal included a downgrading mechanism for legacy systems, this has now been dropped. The local servers are responsible for the local-part of the address, whereas the domain would be restricted by the rules of
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Some mail services support a tag included in the local-part, such that the address is an alias to a prefix of the local-part. Typically the characters following a plus and less often the characters following a minus, so fred+bah@domain and fred+foo@domain might end up in the same inbox as
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An email address consists of two parts, a local-part (sometimes a user name, but not always) and a domain; if the domain is a domain name rather than an IP address then the SMTP client uses the domain name to look up the mail exchange IP address. The general format of an email address is
583:"the local-part MUST be interpreted and assigned semantics only by the host specified in the domain of the address". This means that no assumptions can be made about the meaning of the local-part of another mail server. It is entirely up to the configuration of the mail server. 334:
The addresses found in the header fields of an email message are not directly used by mail exchanges to deliver the message. An email message also contains a message envelope that contains the information for mail routing. While envelope and header addresses may be equal,
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specify different mailboxes; however, many organizations treat uppercase and lowercase letters as equivalent. Indeed, RFC 5321 warns that "a host that expects to receive mail SHOULD avoid defining mailboxes where ... the Local-part is case-sensitive".
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may have a maximum of 255 octets. The formal definitions are in RFC 5322 (sections 3.2.3 and 3.4.1) and RFC 5321—with a more readable form given in the informational RFC 3696 (written by J. Klensin, the author of RFC 5321) and the associated errata.
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The IETF's EAI Working group published RFC 6530 "Overview and Framework for Internationalized Email", which enabled non-ASCII characters to be used in both the local-parts and domain of an email address. RFC 6530 provides for email based on the
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specifies that certain domains, for example those intended for documentation and testing, should not be resolvable and that as a result mail addressed to mailboxes in them and their subdomains should be non-deliverable. Of note for e-mail are
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notation, in which the address was given in the form of a sequence of computers through which the message should be relayed. This was widely used for several years, but was superseded by the Internet standards promulgated by the
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enclosed in brackets. Although the standard requires the local-part to be case-sensitive, it also urges that receiving hosts deliver messages in a case-independent manner, e.g., that the mail system in the domain
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are allowed with restrictions (they are only allowed inside a quoted string, as described in the paragraph below, and in that quoted string, any backslash or double-quote must be preceded once by a backslash);
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box to which messages are delivered. While early messaging systems used a variety of formats for addressing, today, email addresses follow a set of specific rules originally standardized by the
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now supplies a free email account on domain राजस्थान.भारत for every citizen of the state. A leading media house Rajasthan Patrika launched their IDN domain पत्रिका.भारत with contactable email.
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Despite the wide range of special characters which are technically valid, organisations, mail services, mail servers and mail clients in practice often do not accept all of them. For example,
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An email address also may have an associated "display-name" (Display Name) for the recipient, which precedes the address specification, now surrounded by angled brackets, for example:
382:. Email spammers and phishers will often use "Display Name spoofing" to trick their victims, by using a false Display Name, or by using a different email address as the Display Name. 233:. The SMTP client transmits the message to the mail exchange, which may forward it to another mail exchange until it eventually arrives at the host of the recipient's mail system. 315:
receive mail for multiple email addresses, if configured by the administrator. Conversely, a single email address may be the alias to a distribution list to many mailboxes.
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for use by Gujrati, Marathi, Bangali, Tamil, Telugu, Punjabi and Urdu speakers. Indian company XgenPlus.com claims to be the world's first EAI mailbox provider, and the
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is treated specially—it is case-insensitive, and should be forwarded to the domain email administrator. Technically all other local-parts are case-sensitive, therefore
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Email addresses are often requested as input to website as validation of user existence. Other validation methods are available, such as cell phone number validation,
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Significant demand for such addresses is expected in China, Japan, Russia, and other markets that have large user bases in a non-Latin-based writing system.
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addresses, the latter being mailboxes that receive messages regardless of the local-part, are common patterns for achieving a variety of delivery goals.
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may distinguish mailboxes differing only in capitalization of characters of the local-part, although this is not very common. For example,
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Algorithmic tools: Large websites, bulk mailers and spammers require efficient tools to validate email addresses. Such tools depend upon
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Addresses of this form, using various separators between the base name and the tag, are supported by several email services, including
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Browser-based verification: HTML5 forms implemented in many browsers allow email address validation to be handled by the browser.
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Interpretation of the local-part is dependent on the conventions and policies implemented in the mail server. For example,
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exists. Thus many mail servers use other techniques and check the mailbox existence against relevant systems such as the
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Update to Internet Message Format to Allow Group Syntax in the "From:" and "Sender:" Header Fields (Updates RFC 5322)
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conducts a technical and standards working group devoted to internationalization issues of email addresses, entitled
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by many websites and services that provide a user profile or account. For example, if a user wants to login to their
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to check if the mailbox exists. Callback verification is an imperfect solution, as it may be disabled to avoid a
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The transmission of electronic mail from the author's computer and between mail hosts in the Internet uses the
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However, exploiting the case sensitivity of mailbox local-parts impedes interoperability and is discouraged.
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in the form of an email address as the username ID, even though the service in this case is not email.
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Simple Mail Transfer Protocol (Obsoletes RFC 821, Updates RFC 1123, Obsoleted by RFC 5321) (Errata)
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means of delivering messages from a website, e.g., user messages, user actions, to the email inbox.
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part of an email address has to conform to strict guidelines: it must match the requirements for a
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Requirements for Internet Hosts, Application and Support (Updated by RFC 2821, RFC 5321) (Errata)
1334: 1119: 992:(local-part ending with non-alphanumeric character from the list of allowed printable characters) 576:). Common advice is to avoid using some special characters to avoid the risk of rejected emails. 320: 2537:"देश में पहला, प्रदेश के हर नागरिक के लिए मुफ्त ई-वॉल्ट और ई-मेल की सुविधा शुरू - वसुन्धरा राजे" 1617: 1176:), although technical specification detailed in RFC 822 and subsequent RFCs are more extensive. 998:(IP addresses are allowed instead of domains when in square brackets, but strongly discouraged) 677: 2250: 1202:
Several validation techniques may be utilized to validate a user email address. For example,
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In addition to the above ASCII characters, international characters above U+007F, encoded as
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The local-part of the email address may be unquoted or may be enclosed in quotation marks.
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Due to the ubiquity of email in today's world, email addresses are often used as regular
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Standard for the Format of ARPA Internet Text Messages (Obsoleted by RFC 2822) (Errata)
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top-level domain, the government of India in 2011 got approval for ".bharat", (from
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Overview and Framework for Internationalized Email (Obsoletes RFC 4952, 5504, 5825)
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A Recommendation for IPv6 Address Text Representation (Updates RFC 4291) (Errata)
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labels, each label being limited to a length of 63 characters and consisting of:
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1234567890123456789012345678901234567890123456789012345678901234+x@example.com
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Comments are allowed in the domain as well as in the local-part; for example,
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Simple Mail Transfer Protocol (Obsoletes RFC 2821, Updates RFC 1123) (Errata)
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Comments are allowed with parentheses at either end of the local-part; e.g.,
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The maximum total length of the local-part of an email address is 64 octets.
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Verification & Validation Techniques for Email Address Quality Assurance
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An email address is generally recognized as having two parts joined with an
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Internet Message Format (Obsoletes RFC 822, Obsoleted by RFC 5322) (Errata)
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Some companies offer services to validate an email address, often using an
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Internet Message Format (Obsoletes RFC 2822, Updated by RFC 6854) (Errata)
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Pobox supports the use of "+anystring" (plus extensions) with any address.
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Syntactically correct, verified email addresses do not guarantee that an
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Application Techniques for Checking and Transformation of Names (Errata)
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allow configuring an arbitrary separator from the legal character set.
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IP Version 6 Addressing Architecture (Updated by RFC 5952) (Errata)
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only allows creation of email addresses using alphanumerics, dot (
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The text of the tag may be used to apply filtering, or to create
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Identifier of the destination where email messages are delivered
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SMTP Extension for Internationalized Email (Obsoletes RFC 5336)
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Mailbox Names for Common Services, Roles and Functions (Errata)
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Simple Mail Transfer Protocol (Obsoleted by RFCs 2821 and 5321)
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The local-part of a mailbox MUST BE treated as case sensitive.
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fred+@domain or even as fred@domain. For example, the address
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based servers without an extension, but are permitted by the
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address for the purposes of determining account identity.
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i.like.underscores@but_they_are_not_allowed_in_this_part
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Domain names, Implementation and specification (Errata)
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Messaging, Malware and Mobile Anti-Abuse Working Group
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The example addresses below would not be handled by
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email addresses for other networks than the Internet
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may be too technical for most readers to understand
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The RFC defines 1900:Sieve Email Filtering: Subaddress Extension 207:video gaming profile, they would use their 2435:"Email Address Internationalization (eai)" 2299:"New gTLD Dotless Domain Names Prohibited" 2193: 2191: 2082:"Plus addressing and subdomain addressing" 1971:"An Overview of the Andrew Message System" 1532: 1491: 1094:(underscore is not allowed in domain part) 1033: 2380:by Jan Hornych 2011, University of Oxford 1912: 1896: 1789: 1749: 1726: 1724: 1672: 1635: 1548: 1507: 1149:Learn how and when to remove this message 1088:(local-part is longer than 64 characters) 796:, although this is rarely seen except in 73:Learn how and when to remove this message 57:, without removing the technical details. 1940: 1938: 1587: 1010:(begin with underscore different syntax) 869: 594:ignores all dots in the local-part of a 192:, efforts are progressing to permit non- 2415:. IETF. March 17, 2006 – March 18, 2013 2188: 1770: 1730: 1612: 1252: 785:literal, surrounded by square brackets 363:, where the local-part may be up to 64 14: 2768: 2499:"Now, get your email address in Hindi" 2032: 1764: 1721: 1935: 612:denotes the same delivery address as 527:, are permitted by RFC 6531 when the 418:If unquoted, it may use any of these 55:make it understandable to non-experts 2287:"Instant disposable Gmail addresses" 2111:"postale.io's FAQ on sub-addressing" 2016:"Disposable addresses in Yahoo Mail" 1830:or source view, in order to read it. 1131:adding citations to reliable sources 1102: 974:, the first one being double quoted) 311:) directly specifies the mail host. 214: 97:(IETF) in the 1980s, and updated by 29: 2140:"Can I use with my Pobox account?" 1860:Are Email Addresses Case Sensitive? 1015:Valid email addresses with SMTPUTF8 324: 24: 2558: 2251:"Postfix Configuration Parameters" 1543:. p. 15. sec. 2.4. 1502:. p. 15. sec. 2.4. 1263:Email Address Internationalization 943:List of Internet top-level domains 359:The format of an email address is 25: 2787: 2725: 1247:application programming interface 601: 2753: 2742: 2731: 2223: 1432: 1418: 1319:For example, in addition to the 1165:validation, and fax validation. 1107: 274:Internet Message Access Protocol 34: 2529: 2523:"Universal Acceptance in India" 2515: 2491: 2467: 2449: 2427: 2401: 2383: 2371: 2342: 2317: 2291: 2279: 2261: 2243: 2217: 2164: 2150:from the original on 2020-10-03 2132: 2121:from the original on 2020-10-06 2103: 2092:from the original on 2020-10-06 2074: 2056: 2026: 2008: 1995:"Subaddressing/Plus Addressing" 1987: 1963: 1890: 1880:"Receiving someone else's mail" 1872: 1853: 1833: 1804: 1118:needs additional citations for 1029:are only allowed with SMTPUTF8) 916:inbox depending on mail server) 817:john.smith@(comment)example.com 506:john.smith(comment)@example.com 405:Internet Engineering Task Force 196:characters in email addresses. 154: 95:Internet Engineering Task Force 1695: 1651: 1606: 1581: 1567: 1526: 1485: 1387:Traditional Chinese characters 1307:internationalized domain names 1004:(IPv6 uses a different syntax) 802:Internationalized domain names 190:internationalized domain names 13: 1: 2033:Rivera, Rafael (2013-09-17). 1623:Simple Mail Transfer Protocol 1588:Morrison, Sara (2021-09-06). 1540:Simple Mail Transfer Protocol 1499:Simple Mail Transfer Protocol 1478: 625:refers to this convention as 579:According to RFC 5321 2.3.11 497:Space and special characters 410: 238:Simple Mail Transfer Protocol 2226:"4.1.5. extension addresses" 7: 1533:J. Klensin (October 2008). 1492:J. Klensin (October 2008). 1411: 1099:Validation and verification 930:(local domain name with no 864: 281:transmitting email messages 159: 10: 2792: 2681:Internet Mail Architecture 1812:"Sign up for Windows Live" 1618:"Size Limits and Minimums" 1468:Non-Internet email address 1383:: δοκιμή@παράδειγμα.δοκιμή 951:(space between the quotes) 777:This rule is known as the 727:, a list of dot-separated 709:disposable email addresses 629:, but it is also known as 148:An email address, such as 2391:"4.10 Forms — HTML5" 1401:: медведь@с-балалайкой.рф 982:(% escaped mail route to 714: 377:John Smith < 354: 252:, and extensions such as 117:more broadly as either a 1193:directory harvest attack 1187:for the domain or using 735:Uppercase and lowercase 460:!#$ %&'*+-/=?^_`{|}~ 426:uppercase and lowercase 321:electronic mailing lists 268:protocol and either the 2064:"Addresses and Aliases" 1784:. sec. 4.5.3.1.1. 1664:Internet Message Format 1659:"Address Specification" 1335:Government of Rajasthan 1054:a"b(c)d,e:f;g<h>i 1034:Invalid email addresses 955:"john..doe"@example.org 898:(one-letter local-part) 660:Plus (hyphen), Apple's 648:(plus), Runbox (plus), 514:are both equivalent to 488:"John..Doe"@example.com 484:"John.Doe."@example.com 480:".John.Doe"@example.com 341:spoofed email addresses 339:addresses (also called 2737:Validate Email Address 2543:(in Hindi). 2017-08-18 1897:Murchison, K. (2008). 1869:by Heinz Tschabitscher 157:, the symbol @, and a 129:value can be either a 1703:"Spotting a Spoofing" 1630:. sec. 4.5.3.1. 1407:: संपर्क@डाटामेल.भारत 1405:Devanagari characters 1189:callback verification 870:Valid email addresses 458:printable characters 141:, or the more common 2762:at Wikimedia Commons 2329:IBM Knowledge Center 2285:Gina Trapani (2005) 1463:Email authentication 1448:Anti-spam techniques 1329:), written in seven 1253:Internationalization 1228:heuristic algorithms 1127:improve this article 581:Mailbox and Address, 562:Windows Live Hotmail 343:) are often seen in 289:mail transfer agents 270:Post Office Protocol 153:, is made up from a 2525:. 15 February 2017. 1709:. November 19, 2020 1473:International email 1399:Cyrillic characters 1393:Japanese characters 957:(quoted double dot) 690:Courier Mail Server 295:(DNS) to look up a 240:(SMTP), defined in 133:, which contains a 2503:The Economic Times 2461:features.icann.org 2409:"Eai Status Pages" 2205:on 26 January 2012 2144:helpspot.pobox.com 1865:2016-06-03 at the 1232:statistical models 1185:Domain Name System 1078:this\ still\"not\\ 911:(may be routed to 825:are equivalent to 293:domain name system 2758:Media related to 1734:(February 2004). 1667:. sec. 3.4. 1440:technology portal 1331:different scripts 1313:representations. 1159: 1158: 1151: 635:tagged addressing 385:Earlier forms of 361:local-part@domain 264:sites, using the 215:Message transport 209:Microsoft account 180:as equivalent to 163:, which may be a 83: 82: 75: 16:(Redirected from 2783: 2757: 2746: 2735: 2552: 2551: 2549: 2548: 2533: 2527: 2526: 2519: 2513: 2512: 2510: 2509: 2495: 2489: 2488: 2486: 2485: 2471: 2465: 2464: 2453: 2447: 2446: 2444: 2442: 2431: 2425: 2424: 2422: 2420: 2405: 2399: 2398: 2387: 2381: 2375: 2369: 2368: 2366: 2364: 2354: 2346: 2340: 2339: 2337: 2335: 2321: 2315: 2314: 2312: 2310: 2295: 2289: 2283: 2277: 2276: 2265: 2259: 2258: 2247: 2241: 2240: 2238: 2236: 2221: 2215: 2214: 2212: 2210: 2201:. 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Index

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email
Internet Engineering Task Force
RFC
5322
6854

local-part
domain
domain name
IP address
internationalized domain names
ASCII
usernames
Xbox Live
Microsoft account

Simple Mail Transfer Protocol
RFC
5321
5322
RFC
6531
webmail
SMTP
Post Office Protocol
Internet Message Access Protocol

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