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can reject an item at the initial SMTP connection stage or pass it through unchanged for delivery to the user's mailbox. It is also possible to redirect the message for delivery elsewhere, quarantine it for further checking, modify it or 'tag' it in any other way.
245:. Outbound email filtering involves the reverse - scanning email messages from local users before any potentially harmful messages can be delivered to others on the Internet. One method of outbound email filtering that is commonly used by
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at some companies to ensure that employees comply with appropriate policies and laws. Users might also employ a mail filter to prioritize messages, and to sort them into folders based on subject matter or other criteria.
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Mail filters can operate on inbound and outbound email traffic. Inbound email filtering involves scanning messages from the
Internet addressed to users protected by the filtering system or for
289:, which specifies conditions to match and actions to take on matching, which may involve further matching. Some more advanced filters, particularly anti-spam filters, use statistical
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to organize incoming emails. Image filtering can use complex image-analysis algorithms to detect skin-tones and specific body shapes normally associated with pornographic images.
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to organize it according to specified criteria. The term can apply to the intervention of human intelligence, but most often refers to the automatic processing of messages at an
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assets. A catch-all filter will "catch all" of the emails addressed to the domain that do not exist in the mail server - this can help avoid losing emails due to misspelling.
178:. Mailbox providers filter outgoing email to promptly react to spam surges that may result from compromised accounts. A less common use is to
253:, in which email traffic is intercepted and filtered via a transparent proxy within the network. Outbound filtering can also take place in an
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as a service to all of their customers. Anti-virus, anti-spam, URL filtering, and authentication-based rejections are common filter types.
367:
233:). In email programs, users can make personal, "manual" filters that then automatically filter mail according to the chosen criteria.
277:. Other times, code may match keywords in the message body, or perhaps the email address of the sender of the message. More complex
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A rule is a set of conditions, actions, and exceptions that controls how
Outlook processes and organizes messages.
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Mail filters have varying degrees of configurability. Sometimes they make decisions based on matching a
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and logic is possible with programming languages; this is typically implemented with a
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Common uses for mail filters include organizing incoming email and removal of
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Padwick, Gordon; Feddema, Helen Bell (1999). "22: Creating and Using Rules".
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Corporations often use filters to protect their employees and their
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Processing of email to organize it according to specified criteria
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30:"Spam filter" redirects here. For Knowledge's spam filter, see
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to prevent the leakage of sensitive information via email.
463:. Using Series. Indianapolis: Que Publishing. p.
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includes user-generated email filters called "rules".
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Depending on the calling environment, email filtering
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67:. Unsourced material may be challenged and removed.
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431:"A Guide to Smart Filters | InMoat Knowledge Base"
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381:"How Pervasive is ISP Outbound Email Filtering?"
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344:is an RFC standard for describing mail filters
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127:Learn how and when to remove this message
208:can also install mail filters in their
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406:"Inbound and Outbound Email Filtering"
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65:adding citations to reliable sources
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720:Distributed Checksum Clearinghouse
25:
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705:Challenge–response spam filtering
542:Unsolicited digital communication
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342:Sieve (mail filtering language)
52:needs additional citations for
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237:Inbound and outbound filtering
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261:technology in their outbound
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459:Using Microsoft Outlook 2000
193:Anti-spam techniques (users)
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348:White list#Email whitelists
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299:natural language processing
257:. Many corporations employ
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740:Naive Bayes spam filtering
247:Internet service providers
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150:server, possibly applying
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690:
620:
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251:transparent SMTP proxying
715:Disposable email address
577:Directory harvest attack
379:Zonk (31 January 2008).
337:Outbound Spam Protection
332:Markovian discrimination
317:Bayesian spam filtering
293:techniques such as the
291:document classification
283:data-driven programming
901:Communication software
295:naive Bayes classifier
217:information technology
180:inspect outgoing email
327:Information filtering
142:is the processing of
32:Knowledge:Spam filter
725:Email authentication
368:5xx SMTP status code
259:data leak prevention
210:mail transfer agents
201:Email authentication
197:Anti-spam techniques
152:anti-spam techniques
61:improve this article
572:Bulk email software
243:lawful interception
285:language, such as
275:regular expression
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710:Context filtering
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305:Microsoft Outlook
297:while others use
206:Mailbox providers
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76:"Email filtering"
16:(Redirected from
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851:Advance-fee scam
798:Keyword stuffing
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269:Customization
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78: –
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72:Find sources:
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62:
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55:
50:This article
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39:
38:
33:
19:
856:Lottery scam
813:Scraper site
783:Doorway page
653:Mobile phone
633:Cold calling
485:
478:. Retrieved
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450:
438:. Retrieved
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425:
413:. Retrieved
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390:15 September
388:. Retrieved
385:Slashdot.org
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279:control flow
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263:mail servers
255:email server
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231:email client
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97:
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83:
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59:Please help
54:verification
51:
818:Social spam
730:Greylisting
700:Client-side
628:Auto dialer
18:Spam filter
890:Categories
823:Spam blogs
788:Forum spam
765:Spamdexing
638:Flyposting
597:Image spam
559:Email spam
480:10 January
440:19 October
410:thexyz.com
354:References
166:Motivation
87:newspapers
911:Anti-spam
803:Link farm
773:Blog spam
692:Anti-spam
658:Newsgroup
648:Messaging
550:Protocols
896:Spamming
868:Phishing
778:Cloaking
755:Spamhaus
663:Robocall
643:Junk fax
311:See also
287:procmail
159:software
117:May 2024
750:SpamCop
668:Spambot
612:Spambot
602:Joe job
366:With a
187:Methods
101:scholar
506:Curlie
471:
415:15 May
322:CRM114
199:, and
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906:Email
873:Voice
828:Sping
745:SORBS
621:Other
587:DNSWL
582:DNSBL
223:Users
144:email
108:JSTOR
94:books
678:VoIP
482:2017
469:ISBN
442:2021
417:2023
392:2011
174:and
172:spam
148:SMTP
80:news
504:at
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249:is
63:by
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