PERSONAL EMAIL MANAGER USER HELP Websense® Email Security Gateway
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Handling Unwanted Email What Are the Main Sources of Junk Email?
Handling unwanted email Almost entirely based on a presentation by Brian Candler What are the main sources of junk email? · Spam Unsolicited, bulk email Often fraudulent ± penis enlargement, lottery scams, close relatives of African presidents, etc. Low response rate => high volume sent · Viruses, Trojan horses Infected machine sends out mails without the owner 's knowledge · Malicious bounces These are called ªcollateral spamº or ªJoe-jobsº Junk mail is sent with forged MAIL FROM Accepted by some intermediate MTA, but later it bounces Bounces go to innocent third party 1 What are the costs? · Important messages can be accidentally discarded The more junk, the higher the risk · Wasted time Deleting junk Setting up and maintaining ®lters Checking discarded mail for false positives · Wasted bandwidth and disk space Especially for users on modems Viruses and spam attachments can be large · Annoyance, offence, even fraud There are no easy answers! 2 Where can you ®lter? · At the end-user hosts ✓ Each client has full control and customization ✓ Distributes the processing cost ✗ Client must still download each message · On the ISP's mail server ✓ Easier for users ✓ Sometimes can be rejected before receiving the body ✓ Saves disk space on the server ✗ Hard to make ¯exible for users to customize The Joe-job problem · Don't accept a message and then bounce it later If its sender is forged, we are creating a Joe-job · Much better to reject at RCPT TO or DATA stages A real MTA sender will create a bounce Spamware will ignore the rejection · For -
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?.......................................... -
Concept of Mail Protocols Format of an Email Email Addressing
Concept of Mail Protocols Format of an Email Email Addressing A unique addressing system ,has two parts in addressing. Local part defines user mailbox and domain name mention the destination [email protected] Email alias:Create a group email to send email to many people like multicast. Email message fields Here are the meanings of the fields to be filled in when you send an email: ● From: this is your email address; most of the time you will not have to fill in this field, because it is generally set by the email client according to your preferences. ● To: This field is used for the recipient's email address. ● Subject: this is the title that your recipients will see when they want to read the email ● Cc (carbon copy): this allows an email to be send to a large number of people by writing their respective addresses separated by commas ● Bcc (blind carbon copy): This is a Cc, except that the recipient does not see the list of people in the Bcc field ● Message: This is the body of your message Other email functions are: ● Attached Files, Attachments: A file can be attached to an email by specifying its location on the hard drive. ● Signature: If the email client allows it, you are often able to set a signature, meaning a few lines of text which will be added to the end of the document. Email Delivery Queue Unlike ftp/http it is not necessarily to deliver email in real time.Delivery not instantaneous ,It will wait in the queue of outgoing,incoming ,intermediate MTA message queue. -
Glossary Updated – July 2014
Glossary Updated – July 2014 Ad Blocker - A software utility which can be either a browser add-on or integrated within a browser which prevents advertisements from being displayed or third party content from being served. Examples include Adblock Plus and Noscript. Leading browsers offer limited controls to block third party content including Microsoft Internet Explorer 9 and Mozilla Firefox. Address Specification (also known as: email address spec or addr-spec) - Addresses occur in several message header fields to indicate senders and recipients of messages. An address may either be an individual mailbox, or a group of mailboxes. [RFC 2822] Ad Exchange - Ad exchanges facilitate auction-based, real-time buying and serving of ads. Ad exchanges operate by serving as intermediaries between ad networks, publishers, and advertisers. Ad exchanges provide a sales channel to publishers and ad networks, as well as aggregated inventory to advertisers. Ad exchanges’ business models and practices may include features that are similar to those offered by ad networks. Ad Impression (or impressions) -Total number of times an ad (or malvertisement) is served on one or more sites. A single malvertising creative may be served to multiple users as a result of a single incident with upwards to 100,000 or more impressions, depending on the site(s) the malvertising is served on and the frequency of rotation of the ad on the site(s) and the life of the campaign. Ad Network - An ad network is a company that works with a group of Web sites and sells advertising space on their behalf. Ad networks provide an outsourced sales capability for publishers and a means to aggregate inventory and audiences from numerous sources in a single buying opportunity for media buyers. -
Auditing an Email Server Patrick Mattson May 2019
Auditing an Email server Patrick Mattson May 2019 [email protected] Page 1 of 34 Table of Contents Proposal notes ........................................................................................................................................ 4 Learning objective 1 ................................................................................................................................ 6 Learning objective 2 ................................................................................................................................ 6 Learning objective 3 ................................................................................................................................ 6 Learning objective 4 ................................................................................................................................ 6 What are the components of an email server. ......................................................................................... 6 Microsoft Exchange Components ........................................................................................................ 7 Edge Transport - Mail Transfer Agent (MTA) ................................................................................... 7 Other components: ............................................................................................................................. 7 DNS Settings .................................................................................................................................... 7 -
Enotification – Louisiana Presentation
eNotification Brad Harris Louisiana Survey results Louisiana lessons learned Louisiana plans Literature What’s next? Survey results Email sent Always Yes (if on file or No subscription exists) Renewal notice 1 7 9 Involuntary cancel 3* 14 1 with paper too Change notice 3* 14 1 address change only Online status 5 12 deliverables 4 3 12 Paper status 3 14 deliverables 3 14 Data subscriptions 3 3 11 Web changed 3 14 Other 1 1 Survey results Email Contents Attachment Hyperlink Text only N/A Renewal notice 1* 6 1 service companies only Involuntary 1 2 cancel Change notice 3 Online status 3 2 deliverables 1 4 1 Paper status 1 2 deliverables 2 1 Data 2 2 1 1 subscriptions Web changed 1 1 Other 1 1 Survey results Email process Automatic Manual Batch N/A Renewal notice 2 5 1 Involuntary 2 1 cancel Change notice 1 2 Online status 4 deliverables 5 1 Paper status 1 2 deliverables 3 Data 1 4 1 subscriptions Web changed 1 1 1 Other 2 Survey results Emailed from monitored box Yes No N/A Renewal notice 2 4 2 Involuntary cancel 3 Change notice 1 2 Online status 2 3 deliverables 3 3 Paper status 1 1 deliverables 2 1 Data subscriptions 3 2 Web changed 3 Other 1 1 Survey Results Yes By law No N/A Protected from 6 5 3 4 public requests Correction Cancel Nothing N/A attempted subscription Ifbounces 4 1 6 5 Yes No N/A Can resend 12 5 Can forward 8 1 8 Survey results Subscriptions Yes No N/A self sign-up 5 2 10 opt out 5 1 11 unsubscribe multiple 1 2 14 verify signup 1 4 12 update themselves 1 4 12 SPAM Sender Policy Framework record in DNS Notify customers to -
Imail V12 Administrator Help
Ipswitch, Inc. Web: www.imailserver.com 753 Broad Street Phone: 706-312-3535 Suite 200 Fax: 706-868-8655 Augusta, GA 30901-5518 Copyrights ©2011 Ipswitch, Inc. All rights reserved. IMail Server – Administration Help This manual, as well as the software described in it, is furnished under license and may be used or copied only in accordance with the terms of such license. Except as permitted by such license, no part of this publication may be reproduced, photocopied, stored on a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, recording, or otherwise, without the expressed prior written consent of Ipswitch, Inc. The content of this manual is furnished for informational use only, is subject to change without notice, and should not be construed as a commitment by Ipswitch, Inc. While every effort has been made to assure the accuracy of the information contained herein, Ipswitch, Inc. assumes no responsibility for errors or omissions. Ipswitch, Inc. also assumes no liability for damages resulting from the use of the information contained in this document. Ipswitch Collaboration Suite (ICS), the Ipswitch Collaboration Suite (ICS) logo, IMail, the IMail logo, WhatsUp, the WhatsUp logo, WS_FTP, the WS_FTP logos, Ipswitch Instant Messaging (IM), the Ipswitch Instant Messaging (IM) logo, Ipswitch, and the Ipswitch logo are trademarks of Ipswitch, Inc. Other products and their brands or company names are or may be trademarks or registered trademarks, and are the property of their respective companies. Update History December 2011 v12 April 2011 v11.5 October 2010 v11.03 May 2010 v11.02 Contents CHAPTER 1 Introduction to IMail Administrator About Help ..................................................................................................................................................................... -
Trust in Email Begins with Authentication
Trust in Email Begins with Authentication Issued by the Messaging Anti-Abuse Working Group (MAAWG) March 2008 Edited by Dave Crocker Brandenburg InternetWorking Abstract The Internet’s growth allows us to interact with people all over the world. Unfortunately, some of those people do not make good neighbors. Along with the effort to detect and filter the problematic traffic they generate, there is a complementary effort to identify trustworthy participants. In security technology parlance, the first seeks to identify Bad Actors whereas the second creates ways of distinguishing Good Actors. At its simplest, identifying Good Actors can be divided into two activities: A safe means of identifying a participant–such as an author or an operator of an email service–and then a useful means of assessing their trustworthiness. The first activity is called authentication and the second is usually called reputation. This white paper considers the first step: authenticating the identity that asserts responsibility for an email. In it, recent developments in standardized authentication mechanisms are reviewed that have been tailored for use in email anti- abuse efforts. This white paper provides background on authentication as a foundation for understanding current efforts to protect Internet mail. It then looks at the most popular mechanisms currently in use. The paper is intended for a general readership that has basic familiarity with Internet mail service. While this single document is unlikely to be the final word on the topic, MAAWG has striven to capture the current best practices and leading theories regarding email authentication. As a complement to enabling identification of Good Actors, authentication is expected to aid efforts in protecting business’ brands from forgery and phishing attacks. -
Online Identifiers in Everyday Life
© 2010 by Benjamin M. Gross. All rights reserved. ONLINE IDENTIFIERS IN EVERYDAY LIFE BY BENJAMIN M. GROSS DISSERTATION Submied in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Library and Information Science in the Graduate College of the University of Illinois at Urbana-Champaign, 2010 Urbana, Illinois Doctoral Commiee: Associate Professor Michael Twidale, Chair Professor Geof Bowker, University of Pisburgh Professor Chip Bruce Associate Professor Ann Bishop Abstract Identifiers are an essential component of online communication. Email addresses and instant messenger usernames are two of the most common online identi- fiers. is dissertation focuses on the ways that social, technical and policy fac- tors affect individual’s behavior with online identifiers. Research for this dissertation was completed in two parts, an interview-based study drawn from two populations and an examination of the infrastructure for managing identifiers in two large consumer services. e exploratory study ex- amines how individuals use online identifiers to segment and integrate aspects of their lives. e first population is drawn from employees of a financial ser- vice firm with substantial constraints on communication in the workplace. e second population is drawn from a design firm with minimal constraints on com- munication. e two populations provide the opportunity to explore the social, technical, and policy issues that arise from diverse communication needs, uses, strategies, and technologies. e examination of systems focuses on the infras- tructure that Google and Yahoo! provide for individuals to manage their iden- tifiers across multiple services, and the risks and benefits of employing single sign-on systems. -
DMARC Architecture - Identifier Alignment
DMARC Architecture - Identifier Alignment Contents Introduction Terminology DMARC - Identifier Alignment Identifiers Identifier Alignment DKIM Alignment SPF Alignment Alignment Mode Tags Reference Introduction This document describes general Domain-based Message Authentication, Reporting and Conformance (DMARC) architecture concepts, along with Sender Policy Framework (SPF) and DomainKeys Identified Mail (DKIM) alignment requirements in relation to DMARC. Terminology This section describes and provides definition to some of the key terms used within this document. ● EHLO/HELO - The commands that supply the identity of an SMTP client during the initialization of an SMTP session as defined in RFC 5321. ● From header - The From: field specifies the author(s) of a message. It will typically include the display name (what is shown to an end-user by the mail client), along with an email address that contains a local-part and domain name (For example, "John Doe" <[email protected]>) as defined in RFC 5322. ● MAIL FROM - This is derived from the MAIL command at the start of an SMTP session and provides the sender identification as defined in RFC5321. It is also widely known as the envelope sender, return-path or bounce address. DMARC - Identifier Alignment DMARC ties what DKIM and SPF authenticate to what is listed in the From header. This is done by alignment. Alignment requires that the domain identity authenticated by SPF and DKIM match the domain in the email address visible to the end user. Let's start with what an identifier is and why they are important in reference to DMARC. Identifiers Identifiers identify a domain name to be authenticated. -
Socketlabs Best Practices Guidelines for Authentication Table of Contents
SocketLabs Best Practices Guidelines for Authentication Table of Contents I. Introduction 1 II. Authentication at SocketLabs: An Overview 2 III. Understanding Settings and Customization 3 IV. Customizing Your Settings 8 V. Summary of Recommended DNS Records 14 VI. Key Authentication Terms 15 I. Introduction Due to a steady global increase in malicious email tactics. like phishing, spoofing, and forgery, mailbox providers must be very careful about which messages they allow to be delivered. That’s why it is incredibly important for every legitimate email sender to follow the best practices to make their messages clearly identifiable as trustworthy in the eyes of mailbox providers. One of the critical foundational steps when using an email service like SocketLabs is establishing aligned and white-labeled message authentication mechanisms. These measures help demonstrate that your messages are authentic and help facilitate strong inbox placement. Over time, your organization will see improved email performance as you build a trusted sender reputation that further increases the consistency with which your messages are accepted and delivered to the recipient’s inbox. The purpose of this document is to help educate SocketLabs customers about the topic of email authentication and to help explain the important configuration options that you should choose to maximize success. The goal is to help you choose the best path to garner trust, build domain reputation, and help optimize message delivery results. This document is based off of established industry best practices from M3AAWG – the Messaging, Mobile, Malware Anti-Abuse Working Group. As a member of M3AAWG, SocketLabs is proud to contribute to these documents. -
Email Authentication Via Domainkeys Identified Mail (DKIM)
IronPort Email Authentication W H I T E P A P ER Executive Summary The problems of spam, viruses, phishing and most email denial-of-service attacks can all be traced back to a single common cause – lack of authentication in the email protocol SMTP. TABLE OF CONTENTS 1 Executive Summary This lack of authentication means that a receiving mail server cannot reliably 2 Definitions verify that a particular message is in fact from the sender it purports to be from, making it harder to identify friend from foe. 2 History 3 The Authentication Problem The industry has recognized this shortcoming, and a great deal of effort 4 Sender ID and DomainKeys has been put into developing a new standard that will “overlay” SMTP Identified Mail and provide the sender authentication that is so desperately needed. This 9 Adoption Status paper will present a brief history of how this problem evolved, explore the pluses and minuses of the leading standards proposals, and highlight some 10 Why Authenticate? recommendations. 11 The Solution To Bounce Attacks 11 IronPort Systems’ Adoption Recommendations 12 Appendix D O C R E V 0 2 . 0 8 1 IRONPORT EMAIL AUTHENTICATION WHITE PAPER DEFINITIONS Email nomenclature can be a bit confusing, so it is useful to start with some definitions. An email message has an addressing scheme similar to a postal message: HELO/EHLO: The initial contact command between a sending and a receiving mail server, indicating an SMTP conversation. Envelope sender: The address of the sending mail server; not exposed to the end-user, used for managing bounces.