WO2009024145A4 - Method for spam blocking in an e-mail system - Google Patents

Method for spam blocking in an e-mail system Download PDF

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Publication number
WO2009024145A4
WO2009024145A4 PCT/DE2008/075005 DE2008075005W WO2009024145A4 WO 2009024145 A4 WO2009024145 A4 WO 2009024145A4 DE 2008075005 W DE2008075005 W DE 2008075005W WO 2009024145 A4 WO2009024145 A4 WO 2009024145A4
Authority
WO
WIPO (PCT)
Prior art keywords
mail
whitelist
address
channel address
challenge
Prior art date
Application number
PCT/DE2008/075005
Other languages
German (de)
French (fr)
Other versions
WO2009024145A2 (en
WO2009024145A3 (en
Inventor
Rainer Schlund
Original Assignee
Rainer Schlund
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rainer Schlund filed Critical Rainer Schlund
Publication of WO2009024145A2 publication Critical patent/WO2009024145A2/en
Publication of WO2009024145A3 publication Critical patent/WO2009024145A3/en
Publication of WO2009024145A4 publication Critical patent/WO2009024145A4/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L51/00—User-to-user messaging in packet-switching networks, transmitted according to store-and-forward or real-time protocols, e.g. e-mail
    • H04L51/21—Monitoring or handling of messages
    • H04L51/212—Monitoring or handling of messages using filtering or selective blocking

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Information Transfer Between Computers (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The invention relates to a method for spam blocking in an e-mail system, in which particularly a challenge-response method is applied that comprises a white list having e-mail addresses from which e-mails may be sent to an e-mail client (recipient) of the e-mail system. Intermediate steps are proposed for said challenge-response method in order to contain the distribution of spam. For applications in which a computer-generated response is expected, said intermediate steps include providing channel addresses that are able to circumvent the challenge-response method. In addition, options are proposed for evaluating characteristics that spam entails and reacting to said characteristics.

Claims

GEÄNDERTE ANSPRÜCHE beim Internationalen Büro eingegangen am 28. Mai 2009 (28.05.2009) AMENDED CLAIMS received by the International Bureau on 28 May 2009 (28.05.2009)
1. Verfahren zum Schutz vor Spam in einem Mailsystem, das eine Whitelist enthält mit E-Mail-Adressen, von denen aus E-Mails an einen Mailclient des Mailsystems gesandt werden dürfen, wobei dem Mailclient wenigstens eine Channel-Adresse (kryptische E-Mail- Adresse) zugeordnet ist, dadurch gekennzeichnet, dass beim Versenden einer E- Mail von dem Mailclient aus der oder die Empfänger dieser E-Mail in die Whitelist aufgenommen wird bzw. werden, dass E-Mails, die von einer nicht in der Whitelist eingetragenen E-Mail-Adresse an eine lesbare E-Mail-Adresse des Mailclient gesendet werden, mit einer Challenge zurückgesandt werden und der Absender nach Lösen der Challenge automatisiert eine individuelle Channel-Adresse für den Mailclient mitgeteilt bekommt, wonach eine an diese Channel- Adresse gesendete E-Mail an den Mailclient weitergeleitet wird, und dass anstelle einer Übergabe der E-Mail-Adresse des Mailclients an eine Website hierfür eine Channel-Adresse erzeugt und das Mailsystem so erweitert wird, dass an die genannte Channel-Adresse gesendete E-Mails unter Umgehung des Challenge-Response-Systems an den Mailclient weitergeleitet werden.1. A method for protection against spam in a mail system that contains a whitelist with e-mail addresses from which e-mails may be sent to a mail client of the mail system, the mail client at least one channel address (cryptic e-mail - Address) is assigned, characterized in that when sending an e-mail from the mail client of the recipient or the recipient of this e-mail is included in the whitelist or that e-mails that are not registered by a whitelist E-mail address to a readable e-mail address of the mail client to be sent back with a challenge and the sender is automatically notified after solving the Challenge an individual channel address for the mail client, after which one sent to this channel address E-mail is forwarded to the mail client, and that instead of a handover of the e-mail address of the e-mail client to a website for this purpose generates a channel address and the mail system is extended so that emails sent to the named channel address are forwarded to the mail client, bypassing the challenge-response system.
2. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, dass die Channel-Adresse aus einer Liste vorgegebener Adressen entnommen wird. - 14 -2. The method according to claim 1, characterized in that the channel address is taken from a list of predetermined addresses. - 14 -
3. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, dass die Channel-Adresse automatisch generiert wird .3. The method according to claim 1, characterized in that the channel address is automatically generated.
4. Verfahren gemäß Anspruch 3, dadurch gekennzeichnet, dass die Channel-Adresse eine zufällige Komponente enthält .4. The method according to claim 3, characterized in that the channel address contains a random component.
5. Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, dass für die Channel-Adresse eine separate White- list erzeugt wird, wobei alle Absender, die innerhalb einer vorgegebenen Zeitspanne eine E-Mail an die Channel-Adresse senden, automatisch auf diese separate Whitelist gesetzt werden, und wobei nach Ablauf der Zeitspanne diese Whitelist geschlossen wird .5. Method according to claim 1, characterized in that a separate whitelist is generated for the channel address, whereby all senders who send an e-mail to the channel address within a predetermined period of time are automatically set to this separate whitelist and at the end of the period this whitelist is closed.
6. Verfahren gemäß einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Mailsystem ein Zeitglied zur Zeitmessung aufweist, das mit einem Zählelement für erhaltene E-Mails gekoppelt ist, wobei das Mailsystem bei Eintreffen einer E-Mail von einem nicht auf der Whitelist vorhandenen Absender erst nach Ablauf eines mit dem Zeitglied er- mittelten Zeitraumes eine Challenge an den Absender der E-Mail sendet, wenn innerhalb des Zeitraumes weniger als eine vorgegebene, mit dem Zählelement ermittelte Anzahl von E-Mails erhalten wurde.6. The method according to any one of the preceding claims, characterized in that the mail system comprises a timer for timing, which is coupled to a counting element for received e-mails, wherein the mail system upon receipt of an e-mail from a sender not present on the whitelist sends a challenge to the sender of the e-mail only after expiry of a period determined by the timer, if less than a predefined number of e-mails determined with the counting element was received within the period.
7. Verfahren gemäß Anspruch 6, dadurch gekennzeichnet, dass bei Erreichen der vorgegebenen Anzahl eine Systemnachricht erzeugt wird. - 15 -7. The method according to claim 6, characterized in that upon reaching the predetermined number, a system message is generated. - 15 -
8. Verfahren gemäß einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass nach dem Senden einer E-Mail an die E-Mail-Adresse des Mailclient weitere E-Mails desselben Absenders zwischengespeichert werden, bis das genannte Challenge korrekt beantwortet wird.8. The method according to any one of the preceding claims, characterized in that after sending an e-mail to the e-mail address of the mail client further e-mails of the same sender are cached until the said challenge is answered correctly.
9. Verfahren gemäß Anspruch 8, dadurch gekennzeichnet, dass weiterhin ein Zeitglied zur Zeitmessung vor- handen ist, das die Absendung weiterer Challenges nur für eine vorgegebene Zeitdauer unterbindet.9. The method according to claim 8, further comprising a timer for measuring time, which prevents the dispatch of further challenges only for a predetermined period of time.
10. Verfahren gemäß Anspruch 8, dadurch gekennzeichnet, dass eine Auswerteeinheit vorgesehen ist, die ein Verhältnis bildet zwischen der Anzahl von E-Mails10. The method according to claim 8, characterized in that an evaluation unit is provided which forms a ratio between the number of e-mails
; von auf der Whitelist vorhandenen Absendern und der Anzahl von E-Mails, für die ein Challenge zu erzeugen ist.; whitelist senders and the number of emails for which a challenge is to be generated.
11. Verfahren gemäß Anspruch 10, dadurch gekennzeichnet, dass ein Verhältnis für jeden Mail-Server gebildet wird, von dem E-Mails empfangen werden.A method according to claim 10, characterized in that a relationship is formed for each mail server from which e-mails are received.
12. Verfahren gemäß einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass eine Whitelist geführt wird, auf der Absendern individuell zugeordnete Channel-Adressen vermerkt sind.12. The method according to any one of the preceding claims, characterized in that a whitelist is maintained on the sender individually assigned channel addresses are noted.
13. Verfahren gemäß einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass eine Blacklist geführt wird, wobei für auf dieser Blacklist eingetragene Adressen eine Channel-Adresse nicht erzeugt wird. 13. The method according to any one of the preceding claims, characterized in that a blacklist is performed, wherein for registered on this blacklist addresses a channel address is not generated.
PCT/DE2008/075005 2007-08-23 2008-08-25 Method for spam blocking in an e-mail system WO2009024145A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007039967A DE102007039967A1 (en) 2007-08-23 2007-08-23 Method for protection against spam in a mail system
DE102007039967.9 2007-08-23

Publications (3)

Publication Number Publication Date
WO2009024145A2 WO2009024145A2 (en) 2009-02-26
WO2009024145A3 WO2009024145A3 (en) 2009-06-11
WO2009024145A4 true WO2009024145A4 (en) 2009-07-16

Family

ID=40262123

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2008/075005 WO2009024145A2 (en) 2007-08-23 2008-08-25 Method for spam blocking in an e-mail system

Country Status (2)

Country Link
DE (1) DE102007039967A1 (en)
WO (1) WO2009024145A2 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU1595801A (en) * 1999-11-10 2001-06-06 Gator.Com Method and apparatus for web browser automation
US7092992B1 (en) * 2001-02-01 2006-08-15 Mailshell.Com, Inc. Web page filtering including substitution of user-entered email address
US8180834B2 (en) * 2004-10-07 2012-05-15 Computer Associates Think, Inc. System, method, and computer program product for filtering messages and training a classification module

Also Published As

Publication number Publication date
DE102007039967A1 (en) 2009-02-26
WO2009024145A2 (en) 2009-02-26
WO2009024145A3 (en) 2009-06-11

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