DMARC — Defeating E-Mail Abuse
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DMARC and Email Authentication
DMARC and Email Authentication Steve Jones Executive Director DMARC.org Cloud & Messaging Day 2016 Tokyo, Japan November 28th, 2016 What is DMARC.org? • DMARC.org is an independent, non-profit advocate for the use of email authentication • Supported by global industry leaders: Sponsors: Supporters: Copyright © 2016 Trusted Domain Project 2 What Does DMARC Do, Briefly? • DMARC allows the domain owner to signal that fraudulent messages using that domain should be blocked • Mailbox providers use DMARC to detect and block fraudulent messages from reaching your customers • Organizations can use DMARC to perform this filtering on incoming messages – helps protect from some kinds of phishing and “wire transfer fraud” email, also known as Business Email Compromise (BEC) • Encourage your partners/vendors to deploy inbound DMARC filtering for protection when receiving messages • More information available at https://dmarc.org Copyright © 2016 Trusted Domain Project 3 Overview Of Presentation •DMARC Adoption •Case Study - Uber •Technical Challenges •Roadmap Copyright © 2016 Trusted Domain Project 4 DMARC Adoption This section will provide an overview of DMARC adoption since it was introduced, globally and within particular country-specific top-level domains. It will also show how the DMARC policies published by top websites has evolved over the past two years. Copyright © 2016 Trusted Domain Project 5 Deployment & Adoption Highlights 2013: • 60% of 3.3Bn global mailboxes, 80% consumers in US protected • Outlook.com users submitted 50% fewer phishing -
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. -
DHS Mandates DMARC for Email Security
Agari U.S. Federal Government DMARC Adoption: DHS Mandates DMARC for Email Security Executive Summary On October 16, 2017, the U.S. Department of Homeland Security issued a Binding Operational Directive (BOD) 18-01 that mandates the implementation of specific security standards to strengthen email and 82% of all Federal domains have no web site security. As part of this directive, all federal agencies that operate DMARC policy .gov email domains must implement a DMARC monitoring policy (p=none) within 90 days. Furthermore, all federal agencies must move to a reject policy (p=reject) by 1 year. Based on Agari research of public DNS records, 82% percent of all US Federal Government domains do not have a DMARC policy, leaving their constituents unprotected from phishing and other forms of email attacks 86% of Federal that impersonate their agency email domains. Cybercriminals exploit this domains that use DMARC choose Agari 1 vulnerability by sending billions of phishing emails per year claiming to be from these government agencies. 1 Includes all domains that send aggregate data to a 3rd party DMARC vendor. 1 | www.agari.com Email Abuse on Federal Agency Domains Phishing continues to be a pervasive threat in the United States and around the world.The impact of these threats has been felt specifically by government agencies. Beyond the high-profile targeted attacks that have made headlines, criminals are executing phishing attacks leveraging the brand name of agencies. Indeed, over the last six months, Agari has seen an amplification of attacks against our Federal customers. As the following chart indicates, on the email-sending and defensive domains that we monitor, 25% of email volume was malicious or failing authentication. -
DMARC Jesse Thompson, Technical Architect University of Wisconsin-Madison [email protected] Motivation → Authenticity
Email Authenticity with DMARC Jesse Thompson, Technical Architect University of Wisconsin-Madison [email protected] Motivation → Authenticity ● Mail your institution sends isn’t accounted for ● Mail claiming to be your domain may be fraud ● Instead of filtering the bad...we start authenticating the good? Functional Motivators for Email Authenticity 1. Deliverability: Google/MS/etc starting to require 2. Policies: DHS Binding Operational Directive 18-01 3. Security: Stop abuse Build on SPF SPF = Sender Policy Framework Publish in DNS a list of servers authorized for MAIL FROM (SMTP envelope return path). Receivers consult list. https://tools.wordtothewise.com/spf/check/wisc.edu wisc.edu. 3600 IN TXT "v=spf1 ip4:144.92.197.128/25 ?all" Build on DKIM DKIM = Domain Keys Identified Mail Attach signatures to email. Public key in DNS. Receivers verify signature. https://tools.wordtothewise.com/dkim/check/wisc.edu/selector1 DKIM-Signature: v=1; a=rsa-sha256; d=wisc.edu; s=selector1; c=relaxed/relaxed; q=dns/txt; t=1126524832; x=1149015927; h=from:to:subject:date:keywords:keywords; bh=MHIzKDU2Nzf3MDEyNzR1Njc5OTAyMjM0MUY3ODlqBLP=; b=hyjCnOfAKDdLZdKIc9G1q7LoDWlEniSbzc+yuU2zGrtruF00ldcF VoG4WTHNiYwG Build on SPF and DKIM SPF Problems: ○ Users can’t see MAIL FROM / no alignment to Header From domain ○ Forwarding / mailing lists ○ DNS lookup limit of 10 ○ Inconsistent enforcement by receivers DKIM Problems: ○ Users can’t see key selector / no alignment to Header From domain ○ Message modification in transit / mailing lists ○ Key management / vendor support Protagonist → Header From domain Need to create a link between the domain and the message. dmarc.org What is DMARC? Domain-based Message Authentication Reporting and Conformance 1. -
FAQ: DMARC for Email Service Providers Email Authentication Is Becoming a Big Deal
FAQ: DMARC for Email Service Providers Email authentication is becoming a big deal. Here’s a guide to the key standards from ValiMail. FAQ: DMARC for Email Service Providers Port25 Evaluation Requests By Hourly Email Volume 34.22% 17.63% Less Than Greater 10K than 1M 12.09% Between 250K-1M Why email authentication matters: This is how non-authenticated email 30.24% 13.94% will look in Gmail and Outlook, starting sometime in 2016. Between Between 10K-50K 50K-250K WHAT IS DMARC? DMARC — Domain-based Message Authentication, Reporting and Conformance — is an open email authentication standard that sending domains use to block fraudulent emails. DMARC is built on top of two earlier standards — SPF and DKIM — and adds additional Port25 LinkedIn Engagement Data features like reporting, policy definition, and the notion of identity By Company Size alignment. 7.37% DOES DMARC STOP PHISHING? 201-500 Employees When configured correctly, DMARC can completely stop phishing 8.42% attacks in which the attacker sends an email with a ‘From’ address 5,001-10,000 that appears to originate from a protected domain. As this is the Employees 25.26% 10,001+ primary form of phishing attack, DMARC is a very effective tool to Employees defend customers, employees, partners, and others from phishing. 8.42% 11-50 Employees DOES DMARC HELP DELIVERABILITY? Large-scale email receivers, such as Google, Microsoft, and 8.95% 16.32% 1,001-5,000 51-200 Yahoo!, are increasingly requiring that email messages be properly Employees Employees authenticated in a DMARC-compliant way. So adding a DMARC record for a domain, in conjunction with properly configured SPF and/or DKIM records, will help ensure proper delivery. -
Presentations Made by Senders
SES ���� ��� � �� � � � � � � � ������������� DomainKeys ��������� SPF ��������������������� ���������� ����������������� ������������������������������������������������ Contents Introduction 3 Deployment: For Email Receivers 6 Audience 3 Two Sides of the Coin 6 How to Read this White Paper 3 Recording Trusted Senders Who Passed Authentication 6 A Vision for Spam-Free Email 4 Whitelisting Incoming Forwarders 6 The Problem of Abuse 4 What To Do About Forgeries 6 The Underlying Concept 4 Deployment: For ISPs and Enterprises 7 Drivers; or, Who’s Buying It 4 Complementary considerations for ISPs 7 Vision Walkthrough 5 Deployment: For MTA vendors 8 About Sender Authentication 8 Which specification? 8 An Example 8 Conformance testing 8 History 8 Perform SRS and prepend headers when forwarding 8 How IP-based Authentication Works 9 Add ESMTP support for Submitter 8 The SPF record 9 Record authentication and policy results in the headers 8 How SPF Classic Works 9 Join the developers mailing list 8 How Sender ID works 9 Deployment: For MUA vendors 9 How Cryptographic Techniques Work 0 Displaying Authentication-Results 9 Using Multiple Approaches Automatic switching to port 587 9 Reputation Systems Deployment: For ESPs 20 Deployment: For Email Senders 2 Don’t look like a phisher! 20 First, prepare. 2 Delegation 20 Audit Your Outbound Mailstreams 2 Publish Appropriately 20 Construct the record 2 Deployment: For Spammers 2 Think briefly about PRA and Mail-From contexts. 3 Two Types of Spammers 2 Test the record, part 3 Publish SPF and sign with DomainKeys. 2 Put the record in DNS 3 Stop forging random domains. 2 Test the record, part 2 4 Buy your own domains. 2 Keep Track of Violations 4 Reuse an expired domain. -
Combatting Spam Using Mimedefang, Spamassassin and Perl
Combating Spam Using SpamAssassin, MIMEDefang and Perl Copyright 2003 David F. Skoll Roaring Penguin Software Inc. (Booth #23) Administrivia Please turn off or silence cell phones, pagers, Blackberry devices, etc... After the tutorial, please be sure to fill out an evaluation form and return it to the USENIX folks. 2 Overview After this tutorial, you will: Understand how central mail filtering works. Know how to use MIMEDefang to filter mail. Be able to integrate SpamAssassin into your mail filter. Know how to implement mail filtering policies with MIMEDefang and Perl. Know how to fight common spammer tactics. 3 Outline Introduction to Mail Filtering Sendmail's Milter API MIMEDefang Introduction, Architecture Writing MIMEDefang Filters SpamAssassin Integration Advanced Filter Writing Fighting Common Spammer Tactics Advanced Topics Policy Suggestions 4 Assumptions I assume that you: Are familiar with Sendmail configuration. You don't need to be a sendmail.cf guru, but should know the basics. Are familiar with Perl. Again, you don't need to be able to write an AI program in a Perl one- liner, but should be able to read simple Perl scripts. Are running the latest version of Sendmail 8.12 on a modern UNIX or UNIX-like system. 5 Why Filter Mail? The old reason: to stop viruses. The new reason: to stop spam and inappropriate content. Blocking viruses is easy. Block .exe and similar files, and test against signature databases. Blocking spam is hard, but becoming increasingly important. Organizations can even face lawsuits over inappropriate content. 6 Mail filtering is required for many reasons. In addition to the reasons given on the slide, you might need to filter outgoing mail as well to prevent virus propagation, dissemination of sensitive information, etc. -
Account Administrator's Guide
ePrism Email Security Account Administrator’s Guide - V10.4 4225 Executive Sq, Ste 1600 Give us a call: Send us an email: For more info, visit us at: La Jolla, CA 92037-1487 1-800-782-3762 [email protected] www.edgewave.com © 2001—2016 EdgeWave. All rights reserved. The EdgeWave logo is a trademark of EdgeWave Inc. All other trademarks and registered trademarks are hereby acknowledged. Microsoft and Windows are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries. Other product and company names mentioned herein may be the trademarks of their respective owners. The Email Security software and its documentation are copyrighted materials. Law prohibits making unauthorized copies. No part of this software or documentation may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into another language without prior permission of EdgeWave. 10.4 Contents Chapter 1 Overview 1 Overview of Services 1 Email Filtering (EMF) 2 Archive 3 Continuity 3 Encryption 4 Data Loss Protection (DLP) 4 Personal Health Information 4 Personal Financial Information 5 Document Conventions 6 Other Conventions 6 Supported Browsers 7 Reporting Spam to EdgeWave 7 Contacting Us 7 Additional Resources 7 Chapter 2 Portal Overview 8 Navigation Tree 9 Work Area 10 Navigation Icons 10 Getting Started 11 Logging into the portal for the first time 11 Logging into the portal after registration 12 Changing Your Personal Information 12 Configuring Accounts 12 Chapter 3 EdgeWave Administrator -
DMARC: Monitor & Secure Your Email Delivery
Guide DMARC: Monitor & secure your email delivery Chris Nagele Founder of Wildbit postmarkapp.com Read the web version. Do you know every source of email for your domain? Are spammers trying to spoof your email domain for hacking or fraud opportunities? Are you complying with the best email practices to ensure inbox delivery? These are the questions that DMARC answers, giving you full control of email delivery for your company’s domain. At Postmark, email authentication has been extremely important to us from day one. We believe that anyone should be able to easily send emails with proper infrastructure, tools, and email standards without having to pay enterprise prices. DMARC, and our support of it, is a big part of this mission. 2 What is DMARC? DMARC (Domain-based Message Authentication, Reporting & Conformance) is a standard that prevents spammers from using your domain to send email without your permission — also known as spoofing. Spammers can forge the “From” address on messages so the spam appears to come from a user in your domain. A good example of this is PayPal spoofing, where a spammer sends an email to you pretending to be PayPal in an effort to obtain your account information. DMARC ensures these emails get blocked before you even see them in your inbox. In addition, DMARC gives you great visibility and reports into who is sending email on behalf of your domain, ensuring only legitimate email is received. The good news is that DMARC is open and free for anyone to use, allowing you to secure your domain’s emails and gain control of your email delivery. -
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?.......................................... -
DMARC Reports
Bootcamp Shehzad Mirza Director of Operations [email protected] [email protected] DMARC Reporting & Analysis: What Happens Next 3 DMARC DNS TXT Record • Basic: Host: _dmarc. <domainname> Value: v=DMARC1; p=quarantine; rua=mailto:<email address>; ruf=mailto:<email address>; • Complex: Host: _dmarc. <domainname> Value: v=DMARC1; p=none; rua=mailto:<email address>; ruf=mailto:<email address>; fo=1; adkim=r; aspf=r; pct=100; rf=afrf; ri=86400; sp=reject; 4 Overview 5 1 2 3 4 6 7 5 DMARC Reports • DMARC Generates two types of reports: • Aggregate • Forensic 6 Forensic/Failure Reports (ruf tag) • Number of reports is dependent on amount of email sent • Reports will provide insiGht as to which messaGes were marked as suspicious • Concerns with privacy 7 Sample Forensic/Failure Report 8 Aggregate Reports (rua tag) • Reports sent in XML format to email of choice (can be sent to multiple addresses) • Number and lenGth of reports is dependent on amount of email sent • Allows for: • IT staff to correct any issues with valid messages being dropped by the policy • Visibility into which systems are sending email using org’s domain name (authorized and unauthorized sending IP addresses) 9 <?xml version="1.0" encoding="UTF-8" ?> <feedback> <report_metadata> <org_name>google.com</org_name> <email>[email protected]</email> <extra_contact_info>https://support.google.com/a/answer/2466580</extra_contact_info> <report_id>6156901232184779430</report_id> <date_range> <begin>1466121600</begin> <end>1466207999</end> </date_range> -
What Is DMARC, SPF, and DKIM? • How to Configure • Common Mistakes • Best Practices • How Phishes Get By
How to Prevent 81% of Phishing Attacks From Sailing Right Through DMARC, SPF, and DKIM Roger A. Grimes Data-Driven Defense Evangelist [email protected] About Roger • 30 years plus in computer security • Expertise in host and network security, IdM, crypto, PKI, APT, honeypot, cloud security • Consultant to world’s largest companies and militaries for decades • Previous worked for Foundstone, McAfee, Microsoft • Written 11 books and over 1,000 magazine articles • InfoWorld and CSO weekly security columnist since 2005 • Frequently interviewed by magazines (e.g. Newsweek) and radio shows (e.g. NPR’s All Things Considered) Roger A. Grimes Certification exams passed include: Data-Driven Defense Evangelist KnowBe4, Inc. • CPA • CISSP Twitter: @RogerAGrimes • CISM, CISA LinkedIn: https://www.linkedin.com/in/rogeragrimes/ • MCSE: Security, MCP, MVP • CEH, TISCA, Security+, CHFI • yada, yada Roger’s Books 3 KnowBe4, Inc. • The world’s most popular integrated Security Awareness Training and Simulated Phishing platform • Based in Tampa Bay, Florida, founded in 2010 • CEO & employees are ex-antivirus, IT Security pros • 200% growth year over year • We help tens of thousands of organizations manage the problem of social engineering 4 Today’s Presentation • What is DMARC, SPF, and DKIM? • How to Configure • Common Mistakes • Best Practices • How Phishes Get By 5 • What is DMARC, SPF, and DKIM? § How to Configure Agenda • Best Practices • How Phishes Get By 6 DMARC, DKIM, SPF Global Phishing Protection Standards • Sender Policy Framework (SPF) • Domain