Sender Policy Framework — Википедия
Sender Policy Framework — ВикипедияSender Policy Framework — Википедия
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Sender Policy Framework — Википедия
Sender Policy Framework — Википедия
Что такое SPF (Sender Policy Framework)?
Sender Policy Framework — Википедия
Sender Policy Framework
Sender Policy Framework — Википедия
SPF позволяет владельцу домена указать в TXT-записи, соответствующей имени домена , специальным образом сформированную строку, указывающую список серверов, имеющих право отправлять email -сообщения с обратными адресами в этом домене. Агенты передачи почты, получающие почтовые сообщения, могут запрашивать SPF-информацию с помощью простого DNS -запроса, верифицируя таким образом сервер отправителя. ПО для фильтрации спама SpamAssassin версии 3. Wikimedia Foundation. Sender Rewriting Scheme — SRS is a technique to re mailan email message so that eventual Delivery Status Notificationscan reach the original message sender. We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this. Sender Policy Framework. Толкование Перевод. Благодаря SPF можно проверить, не подделан ли домен отправителя. Категории: Электронная почта Интернет-протоколы. Экспорт словарей на сайты , сделанные на PHP,. Пометить текст и поделиться Искать во всех словарях Искать в переводах Искать в Интернете. Содержание 1 Принцип работы 1.
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Sender Policy Framework — Википедия
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PTR, DKIM, DMARC, SPF
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Sender Policy Framework — Википедия
Sender Policy Framework SPF is an email authentication method designed to detect forging sender addresses during the delivery of the email. The first public mention of the concept was in but went mostly unnoticed. Over the next six months, a large number of changes were made and a large community had started working on SPF. The Simple Mail Transfer Protocol permits any computer to send email claiming to be from any source address. This is exploited by spammers who often use forged email addresses , \\\\\\[12\\\\\\] making it more difficult to trace a message back to its source, and easy for spammers to hide their identity in order to avoid responsibility. It is also used in phishing techniques, where users can be duped into disclosing private information in response to an email purportedly sent by an organization such as a bank. SPF allows the owner of an Internet domain to specify which computers are authorized to send mail with envelope-from addresses in that domain, using Domain Name System DNS records. Receivers verifying the SPF information in TXT records may reject messages from unauthorized sources before receiving the body of the message. Current practice requires the use of TXT records, \\\\\\[13\\\\\\] just as early implementations did. The envelope-from address is transmitted at the beginning of the SMTP dialog. If the server rejects the domain, the unauthorized client should receive a rejection message, and if that client was a relaying message transfer agent MTA , a bounce message to the original envelope-from address may be generated. If the server accepts the domain, and subsequently also accepts the recipients and the body of the message, it should insert a Return-Path field in the message header in order to save the envelope-from address. While the address in the Return-Path often matches other originator addresses in the mail header such as the header-from , this is not necessarily the case, and SPF does not prevent forgery of these other addresses such as sender header. Spammers can send email with an SPF PASS result if they have an account in a domain with a sender policy, or abuse a compromised system in this domain. However, doing so makes the spammer easier to trace. They receive large numbers of unsolicited error messages and other auto-replies. If such receivers use SPF to specify their legitimate source IP addresses and indicate FAIL result for all other addresses, receivers checking SPF can reject forgeries, thus reducing or eliminating the amount of backscatter. SPF has potential advantages beyond helping identify unwanted mail. Scenarios like compromised systems and shared sending mailers limit this use. If a domain publishes an SPF record, spammers and phishers are less likely to forge emails pretending to be from that domain, because the forged emails are more likely to be caught in spam filters which check the SPF record. Therefore, an SPF-protected domain is less attractive to spammers and phishers. Because an SPF-protected domain is less attractive as a spoofed address, it is less likely to be blacklisted by spam filters and so ultimately the legitimate email from the domain is more likely to get through. SPF breaks plain message forwarding. They should test e. See below for a list of alternatives to plain message forwarding. It can also be used in reputation systems any white or black list is a simple case of a reputation system. The records laid out below are in typical DNS syntax, for example:. The following words provide mechanisms to use to determine if a domain is eligible to send mail. The 'ip4' and 'a' specify the systems permitted to send messages for the given domain. The '-all' at the end specifies that, if the previous mechanisms did not match, the message should be rejected. The modifiers allow for future extensions to the framework. To date only the two modifiers defined in the RFC have been widely deployed:. Skipping erroneous mechanisms cannot work as expected, therefore include:bad. Another safeguard is the maximum of ten mechanisms querying DNS, i. Except the first one, all those queries count towards the limit of Note that mechanisms ip4 and all need no DNS lookup. To enable the rapid testing and deployment, initial versions of SPF checked for its setting in the DNS TXT record of the sending domain - even though this record was traditionally supposed to be free-form text with no semantics attached. In the use of this records was discontinued after the SPFbis working group concluded that ' Additionally proprietary implementation beyond the scope of the SPF schema allow to protect against certain header-from spoofing implementations. Anti-spam software such as SpamAssassin version 3. In their revised 'Sender Best Communication Practices' the MAAWG stated: 'Authentication supports transparency by further identifying the sender s of a message, while also contributing to the reduction or elimination of spoofed and forged addresses'. From Wikipedia, the free encyclopedia. Simple email-validation system designed to detect email spoofing. This article possibly contains original research. Please improve it by verifying the claims made and adding inline citations. Statements consisting only of original research should be removed. August Learn how and when to remove this template message. Archived from the original on 20 April Retrieved 23 September A carefully tailored SPF record will reduce the likelihood of your domain name getting fraudulently spoofed and keep your messages from getting flagged as spam before they reach your recipients. Email spoofing is the creation of email messages with a forged sender address; something that is simple to do because many mail servers do not perform authentication. Spam and phishing emails typically use such spoofing to mislead the recipient about the origin of the message. Retrieved 15 May Retrieved 16 May Retrieved 16 December RFC Retrieved 26 April Email Manual. May Archived from the original on January 29, Retrieved Retrieved 25 August Archived from the original on April Archived from the original PDF on Categories : Email authentication Internet architecture Internet governance Internet protocols Network addressing Spam filtering. Hidden categories: Webarchive template wayback links Pages using RFC magic links Articles with short description Articles that may contain original research from August All articles that may contain original research Wikipedia articles in need of updating from March All Wikipedia articles in need of updating. Namespaces Article Talk. Views Read Edit View history. By using this site, you agree to the Terms of Use and Privacy Policy. Matches always; used for a default result like -all for all IPs not matched by prior mechanisms. This mechanism is discouraged and should be avoided, if possible. If the given domain name resolves to any address, match no matter the address it resolves to. This is rarely used. References the policy of another domain. However, if the included policy fails, processing continues.
Sender Policy Framework — Википедия
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Sender Policy Framework — Википедия