New PDF release: E-Mail Security: A Pocket Guide

By IT Governance Institute

ISBN-10: 1849280967

ISBN-13: 9781849280969

Don't allow an electronic mail reason a knowledge protection incident at your organization - purchase this pocket consultant this present day! your enterprise is dependent upon e mail for its daily dealings with companions, providers and consumers. whereas electronic mail is a useful kind of verbal exchange, it additionally represents a possible danger for your info protection. e mail may well turn into the ability for criminals to put in a virulent disease or malicious software program in your laptop approach and fraudsters will try and use emails to procure delicate info via phishing scams. with the intention to protect your company's skill to operate, it really is necessary to have a good electronic mail safety coverage in position, and to make sure your employees comprehend the dangers linked to e mail. This pocket advisor may help companies to handle an important concerns. Its accomplished strategy covers either the technical and the managerial features of the topic, supplying beneficial insights for IT pros, managers and bosses, in addition to for person clients of e mail. learn this pocket advisor to - *Defend your small business from assault *Use e-mail consumers to enhance safeguard *Preserve confidentiality *Protect your company's popularity The pocket consultant offers a concise connection with the most safety matters affecting those who installation and use e-mail to help their firms, contemplating electronic mail when it comes to its value in a company context, and focusing upon why potent defense coverage and safeguards are an important in making sure the viability of industrial operations.

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Extra info for E-Mail Security: A Pocket Guide

Example text

In particular, most UBE-sending systems do not retry failed connections. As such, greylisting allows legitimate servers (with correctly configured retry cycles) to still send e-mail (albeit with a two-minute delay) while rejecting most UBE. However, it should be noted that very old e-mail clients (and servers) may consider a 451 error code as a permanent failure and not attempt further retries – effectively rendering the destination unreachable. Another problem with greylisting is that if the server retry 57 5: Server Side Security delay is set too long, users may perceive a delay in the normally instantaneous e-mail delivery.

Threats to confidentiality, integrity and availability are considered as well as a range of technical countermeasures to detect, prevent or minimise the impact of an attack. Specific attention is given to solutions to mitigate malware, spam and phishing. Although Chapter 3 introduced a number of countermeasures that can be deployed within the client, the majority of protection is provided at the server end of any e-mail communication. The sections that follow describe a wide range of techniques that can be used on the mail server to protect recipients from malware and Unsolicited Bulk E-mail (UBE), as well as preventing organisational systems being used as the source of UBE.

Any host acting as a mail server should have a DNS MX entry to be able to provide its own incoming mail service, hence any host attempting to send email without a suitable MX entry cannot receive a Non Delivery Report (NDR) and is likely to be a source of UBE. Sender Policy Framework (SPF): SPF21 addresses the problem of source address spoofing by verifying that the incoming e-mail connection is from an approved sender (as determined by the administrator of the sending domain). This is a subtle difference to the host resolving described above in that MX entries are used to define the host that handles incoming e-mail while SPF uses a custom DNS entry (SPF record type) to advertise the hosts within an organisation that are allowed to send e-mail.

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E-Mail Security: A Pocket Guide by IT Governance Institute

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