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Fighting Spam
Fighting Spam 2017-10-18 Dianne Skoll Roaring Penguin Software Inc. [email protected] www.roaringpenguin.com Approaches to Fighting Spam ● Reputation-Based (IP, Domain) ● Authentication (SPF, DKIM, DMARC) ● Behavior-Based (greylisting, botnet detection) ● Content-Based ● Defense in Depth www.roaringpenguin.com IP Reputation ● Typically implemented by DNSBLs. ● Reactive – IPs are listed only after they spam. ● Some DNSBLs are high-quality. Most are not. ● Few are transparent as to listing and delisting criteria. ● Few have good IPv6 coverage. ● Useful as a first pass to cut down on spam passing to the rest of the filtering stages. www.roaringpenguin.com Domain Reputation ● Also typically implemented by DNSBLs. ● Reactive. ● Low to moderate hit rate. ● May be applied to sending domain and/or to domains of URLs in the message body. www.roaringpenguin.com Domain Reputation - 2 ● Spammers often register throwaway domains as sending domains. ● Idea: Penalize messages from “newly-seen” domains. ● CanIt 10.1.7 tracks domains seen across all CanIt installations and permits you to (mildly) penalize mail from only-recently-seen domains. www.roaringpenguin.com Authentication: SPF ● SPF (Sender Policy Framework) is a mechanism whereby domain owners can declare which machines may send email on their domains’ behalf. ● For arbitrary domains, an SPF “pass” is a mild spam indicator! ● Spammers are better at setting up SPF than many legitimate administrators. www.roaringpenguin.com Authentication: SPF - 2 ● SPF is useful for trusted domains (banks, PayPal, eBay, etc.) ● Adding points on SPF “fail” or “softfail” is useful. ● Subtracting points on SPF “pass” for arbitrary domains is dangerous. ● Subtracting points on SPF “pass” for trusted domains is useful. -
Sicherer Betrieb Von E-Mail-Servern (Isi-S)
Sicherer Betrieb von E-Mail-Servern (ISi-Mail-Server) BSI-Studie zur Internet-Sicherheit (ISi-S) Version 1.0 ISi-Reihe ISi-S Sicherer Betrieb von E-Mail-Servern Vervielfältigung und Verbreitung Bitte beachten Sie, dass das Werk einschließlich aller Teile urheberrechtlich geschützt ist. Erlaubt sind die Vervielfältigung und Verbreitung zu nicht-kommerziellen Zwecken, insbesondere zu Zwecken der Ausbildung, Schulung, Information oder hausinternen Bekanntmachung, sofern sie unter Hinweis auf die ISi-Reihe des BSI als Quelle erfolgen. Dies ist ein Werk der ISi-Reihe. Ein vollständiges Verzeichnis der erschienenen Bände findet man auf den Internet-Seiten des BSI. http://www.bsi.bund.de oder http://www.isi-reihe.de Bundesamt für Sicherheit in der Informationstechnik ISi-Projektgruppe Postfach 20 03 63 53133 Bonn Tel. +49 (0) 228 99 9582-0 E-Mail: [email protected] Internet: http://www.bsi.bund.de © Bundesamt für Sicherheit in der Informationstechnik 2009 2 Bundesamt für Sicherheit in der Informationstechnik ISi-Reihe ISi-S Sicherer Betrieb von E-Mail-Servern Vorwort Liebe Leserinnen und Leser, immer mehr Prozesse verlagern sich in die virtuelle Welt des Internets: Kommunikation und Daten- austausch erfolgen per E-Mail, Bankgeschäfte und Einkäufe werden zunehmend online getätigt. Dabei müssen häufig persönliche und vertrauliche Daten über das Internet versendet werden. Diese sind ein attraktives und lukratives Ziel für Online-Kriminelle, die heute international organisiert und professionell strukturiert zusammen arbeiten. IT-Kriminalität ist für die Angreifer ein lohnenswertes Geschäft bei vergleichsweise niedrigem Risiko. Identitätsdiebstahl und Angriffe mit Schadprogram- men unterschiedlichster Art gehören bei der Nutzung des Internets zu den ernstzunehmenden Bedrohungen für alle Anwender. -
Dynamic Allocation of Mail Server Resources Among Users
INTERNATIONAL JOURNAL OF SCIENTIFIC & TECHNOLOGY RESEARCH VOLUME 9, ISSUE 03, MARCH 2020 ISSN 2277-8616 Dynamic Allocation Of Mail Server Resources Among Users Basti M.Aliyeva Index:The article was dedicated to the solution of the problem on the dynamic allocation of mail server resources among users. It was noted that recently the electronic mail system had undergone serious changes and new features have been added to this system. The article examines the working principles of email and defines possible operating modes for subscribers. It was noted that mail server memory should be dynamically allocated among users so that the email can successfully perform its functions. In the article,the linear programming is applied to the problem of dynamic allocation of mail server memory. Known methods at every operation can resolve this issue.Proximity measure has been defined based on the Levenstein Distance (LD) for the determination of the renewal of documents on the server to improve the use of the server resources. This tool can be used to determine whether the documents have changed on the server.In the result, similar documents can be identified, and their number can be reduced up to one. Key Words: email server, dynamic allocation of the memory, operating modes of subscribes, Levenstein Distance (LD), Measures of document proximity. ———————————————————— 1. INTRODUCTİON information networks. In this case, it is essential to pay It is known that e-mail is one of the most important special attention to data transmission issues.Numerous information resources of the Internet, as well as it is the ways to transmit data and many software tools have been most massive communication tool. -
Design and Management of Email Service
Design and Management of Email Service Source : homepage.ntu.edu.tw/~jsc/2005-mail.ppt Outline Introduction to the architecture and operation of SMTP Design of a suitable email system – Webmail solutions Postfix and simple configuration samples Spam and virus filtering Conclusion 2 Overview Electronic mail service has already evolved into one of the major Internet applications. It is not only fundamental, but also a must. Users may become impatient when mails were delayed, not to mention failed to access their emails. – Imagine we meet the situation of power failure or cut of water supply 3 Architecture of a Simple Mail System Consists of the following components – MTA - Mail transfer agent Sending and forwarding emails Server end – MDA - Mail delivery agent Delivering emails to recipients’ mailbox Server end – Pop3/Imap4 Daemons For users to download their mailboxs Server end – MUA - Mail user agent Reading and composing emails 4 Client end Architecture of a Simple Mail System Protocols Used for Mail System Protocols – For computer programs to communicate with each other – Similar to languages that human beings speak SMTP – Simple Mail Transfer Protocol – Too simple to provide any “advanced features” Authentication Authorization POP3 – Post Office Protocol version 3 – Simple IMAP4 – Internet Message Access Protocol version 4 – Fully compatible with internet message standards, e.g. MIME. – Allow messages to be accessed from more than one computer. – Provide support for online, offline, and disconnected modes. 6 – Multiple and share folders. Mail Forwarding Between Servers How to Find the Way to the Destination? How do we find the way to [email protected]? 8 DNS: The Key to All Internet Services Query DNS server by the address part of email address.([email protected]) 1. -
Delivering Results to the Inbox Sailthru’S 2020 Playbook on Deliverability, Why It’S Imperative and How It Drives Business Results Introduction to Deliverability
Delivering Results to the Inbox Sailthru’s 2020 Playbook on Deliverability, Why It’s Imperative and How It Drives Business Results Introduction to Deliverability Every day, people receive more than 293 billion Deliverability is the unsung hero of email marketing, emails, a staggering number that only represents ultimately ensuring a company’s emails reach their the tip of the iceberg. Why? The actual number intended recipients. It’s determined by a host of of emails sent is closer to 5.9 quadrillion, with the factors, including the engagement of your subscribers overwhelming majority blocked outright or delivered and the quality of your lists. All together, these factors to the spam folder. result in your sender reputation score, which is used to determine how the ISPs treat your email stream. Something many people don’t realize is that to the Deliverability is also a background player, so far in the major Internet Service Providers (ISPs) — Gmail, shadows that many people don’t think about it, until Yahoo!, Hotmail, Comcast and AOL — “spam” there’s a major issue. doesn’t refer to marketing messages people may find annoying, but rather malicious email filled with That’s why Sailthru’s deliverability team created this scams and viruses. In order to protect their networks guide. Read on to learn more about how deliverability and their customers, the ISPs cast a wide net. If a works on the back-end and how it impacts revenue, message is deemed to be spam by the ISP’s filters, it’s your sender reputation and how to maintain a good dead on arrival, never to see the light of the inbox, as one, and best practices for list management, email protecting users’ inboxes is the top priority of any ISP. -
Spam, Spammers, and Spam Control a White Paper by Ferris Research March 2009
Spam, Spammers, and Spam Control A White Paper by Ferris Research March 2009. Report #810 Ferris Research, Inc. One San Antonio Place San Francisco, Calif. 94133, USA Phone: +1 (650) 452-6215 Fax: +1 (408) 228-8067 www.ferris.com Table of Contents Spam, Spammers, and Spam Control................................................3 Defining Spam.................................................................................3 Spammer Tactics .............................................................................3 Sending Mechanisms.................................................................4 Spammer Tricks.........................................................................4 Techniques for Identifying Spam ....................................................5 Connection Analysis..................................................................5 Behavioral Analysis...................................................................6 Content Scanning.......................................................................6 Controlling Spam: How and Where ................................................7 The Key Role of Reputation Services .......................................7 Conclusion: An Arms Race.............................................................8 Trend Micro Interview........................................................................9 Ferris Analyzer Information Service. Report #810. March 2009. © 2009 Ferris Research, Inc. All rights reserved. This document may be copied or freely reproduced provided you -
ITU Botnet Mitigation Toolkit Background Information
ITU Botnet Mitigation Toolkit Background Information ICT Applications and Cybersecurity Division Policies and Strategies Department ITU Telecommunication Development Sector January 2008 Acknowledgements Botnets (also called zombie armies or drone armies) are networks of compromised computers infected with viruses or malware to turn them into “zombies” or “robots” – computers that can be controlled without the owners’ knowledge. Criminals can use the collective computing power and connected bandwidth of these externally-controlled networks for malicious purposes and criminal activities, including, inter alia, generation of spam e-mails, launching of Distributed Denial of Service (DDoS) attacks, alteration or destruction of data, and identity theft. The threat from botnets is growing fast. The latest (2007) generation of botnets such as the Storm Worm uses particularly aggressive techniques such as fast-flux networks and striking back with DDoS attacks against security vendors trying to mitigate them. An underground economy has now sprung up around botnets, yielding significant revenues for authors of computer viruses, botnet controllers and criminals who commission this illegal activity by renting botnets. In response to this growing threat, ITU is developing a Botnet Mitigation Toolkit to assist in mitigating the problem of botnets. This document provides background information on the toolkit. The toolkit, developed by Mr. Suresh Ramasubramanian, draws on existing resources, identifies relevant local and international stakeholders, and -
M AAWG: Hosting Past, Present & Future
3 M AAWG: Hosting Past, Present & Future Justin Lane - BlueHost and M3AAWG Hosting Co-Chair Jesse Sowell, PhD and M3AAWG Advisor 5 May 2016 LACNIC 25, La Habana, Cuba www.m3aawg.org © 2015 Messaging, Malware and Mobile Anti-Abuse Working Group Hosting: Not a Big Issue, Right? For many years the Community looked at Hosting Companies like this picture. We where a small area that did not look to be that important. www.m3aawg.org © 2015 Messaging, Malware and Mobile Anti-Abuse Working Group A Brief History of Hosting Hosting Companies in the beginning where a small part of the overall environment. Most of the Hosting Companies at the time offered plans that gave their clients 20-50MB of space to use for their websites. ESP’s and ISP’s where much bigger players. www.m3aawg.org © 2015 Messaging, Malware and Mobile Anti-Abuse Working Group What Hosting Offers Hosting Companies were able to offer all the services needed to get a company online and ready to service their customers. • Email Services • CMS, and Webdesign • Hardware from Dedicated Servers or Colocation Servers to Shared or Virtual Server Space • Bandwidth for your Business, Dedicated Ips and SSL Services • Access to Hardware that most smaller businesses were not able to afford on their own. www.m3aawg.org © 2015 Messaging, Malware and Mobile Anti-Abuse Working Group What is Happening Today? As the community got better at policing ISP’s, ESP’s and other problem areas, the criminal elements began to migrate to the Hosting Platforms. With Hosting Companies these criminal elements were even better positioned to carry out their plans. -
Set up Mail Server Documentation 1.0
Set Up Mail Server Documentation 1.0 Nosy 2014 01 23 Contents 1 1 1.1......................................................1 1.2......................................................2 2 11 3 13 3.1...................................................... 13 3.2...................................................... 13 3.3...................................................... 13 4 15 5 17 5.1...................................................... 17 5.2...................................................... 17 5.3...................................................... 17 5.4...................................................... 18 6 19 6.1...................................................... 19 6.2...................................................... 28 6.3...................................................... 32 6.4 Webmail................................................. 36 6.5...................................................... 37 6.6...................................................... 38 7 39 7.1...................................................... 39 7.2 SQL.................................................... 41 8 43 8.1...................................................... 43 8.2 strategy.................................................. 43 8.3...................................................... 44 8.4...................................................... 45 8.5...................................................... 45 8.6 Telnet................................................... 46 8.7 Can postfix receive?.......................................... -
IFIP AICT 394, Pp
A Scalable Spam Filtering Architecture Nuno Ferreira1, Gracinda Carvalho1, and Paulo Rogério Pereira2 1 Universidade Aberta, Portugal 2 INESC-ID, Instituto Superior Técnico, Technical University of Lisbon, Portugal [email protected], [email protected], [email protected] Abstract. The proposed spam filtering architecture for MTA1 servers is a component based architecture that allows distributed processing and centralized knowledge. This architecture allows heterogeneous systems to coexist and benefit from a centralized knowledge source and filtering rules. MTA servers in the infrastructure contribute to a common knowledge, allowing for a more rational resource usage. The architecture is fully scalable, ranging from all-in- one system with minimal components instances, to multiple components instances distributed across multiple systems. Filtering rules can be implemented as independent modules that can be added, removed or modified without impact on MTA servers operation. A proof-of-concept solution was developed. Most of spam is filtered due to a grey-listing effect from the architecture itself. Using simple filters as Domain Name System black and white lists, and Sender Policy Framework validation, it is possible to guarantee a spam filtering effective, efficient and virtually without false positives. Keywords: spam filtering, distributed architecture, component based, centralized knowledge, heterogeneous system, scalable deployment, dynamic rules, modular implementation. 1 Introduction Internet mail spam2 is a problem for most organizations and individuals. Receiving spam on mobile devices, and on other connected appliances, is yet a bigger problem, as these platforms are not the most appropriate for spam filtering. Spam can be seen as belonging to one of two major categories: Fraud and Commercial. -
PERANCANGAN MAIL SERVER INTRANET BERBASIS WEB BASE DENGAN OPTIMALISASI OPERASI SISTEM CLIENT Aziz Setyawan
JURNAL TEKNIK KOMPUTER VOL.I NO.1 FEBRUARI 2015 AMIK BSI PERANCANGAN MAIL SERVER INTRANET BERBASIS WEB BASE DENGAN OPTIMALISASI OPERASI SISTEM CLIENT Aziz Setyawan. H Abstract — Windows 7 operating system is a client-based operating Dengan mail berbasis web base pengguna dapat menggunakan system, or as a home edition. Which is used by the pengguna and sebuah aplikasi web browser tanpa meyimpan histori mail yang telah not as a server. With the use of the operating system is used as a digunakan oleh pengguna lain. Dengan system operasi berbasis client server or coorperate agencies no longer need to use a server-based yaitu windows 7 dapat dimaksimalkan untuk menjadi server. operating system that has had to spend to purchase a server license. E-mail server is a server system that can serve as a collective Kata kunci : Windows 7, Mail server, Web Base. storage mail to mail-mail client. Mail function to communicate information to each pengguna without the need for a print and . nature will always be saved unless the pengguna do the removal, with this system the pengguna can perform information together. I. PENDAHULUAN Development mail server rather different from the mail server at the time of development ever before, this is seen from the windows server computer operating system being used. This is because when Spesifikasi pada sistem operasi pada produk microsoft the windows issuing windows server 2008 in the development of Windows mempunyai perbedaan pada fungsinya. Dikarenakan this version of the mail server does not provide POP3 protocol spesifikasi pada fungsi inilah akan bergantung pada harga (Post Office Protocol version 3) is no longer available in the yang dikeluarkan oleh sebuah instansi maupun perorangan Windows server operating systems ranging from Windows Server dalam memiliki produk sistem operasi yang dikeluarkan oleh 2008. -
Email Authentication Faqs V3
Email Authentication GUIDE Frequently Asked QUES T ION S T OGETHER STRONGER EMAIL AUTHENTICATION Marketers that use email for communication and transactional purposes should adopt and use identification and authentication protocols.” This document will explain what authentication is – includ- ing some recommendations on what you should do as an email marketer to implement these guidelines within your organization. * This Guide should not be considered as legal advice. It is being provided for informational purposes only. Please review your email program with your legal counsel to ensure that your program is meeting appropriate legal requirements. THIS COMPLIANCE GUIDE COVERS: Basics of Email Authentication Technologies Basic FAQs on the DMA’s Email Authentication Guidelines Implementation: Complementary Types of Email Authentication Systems Beyond Authentication: Email Reputation Email Authentication Resources for Marketers 1. What Do the DMA’s Email Authentication Guidelines Require? The DMA’s guidelines require marketers to choose and implement authentication technolo- gies in their email systems. It is up to your company to decide what kind of authentication protocol to use, though all are recommended based on current-day trends. The DMA does not require nor endorse the use of any specific protocol, as there are several interoperable, inexpensive, and easy to implement solutions available today. 2. Why does the DMA Require Members to Authenticate Their Email Systems? The DMA requires its members to authenticate their email systems primarily because mailbox providers (aka ISPs, MSPs or receivers) are increasingly requiring authentication. This strongly aligns with a growing trend in the email deliverability industry that’s leaning more towards domain-based reputation (as opposed to IP-based reputation a couple of years ago).