By Paul Dowland, Steven Furnell, Paul Dowland
This pocket advisor might help companies to handle crucial matters. Its entire process covers either the technical and the managerial points of the topic, supplying worthwhile insights for IT pros, managers and managers, in addition to for person clients of email.
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This is often coupled with automatic scanning of incoming e-mails for indicators of phishing/spam content. Messages flagged as suspicious or containing spam/phishing indicators are often moved to quarantine folders where users have the option to review the filtering decisions or restore blocked e-mails. Users need to be aware that these mechanisms are not 100% reliable and there will always be a proportion of false positives (messages incorrectly classified as malicious/suspicious) and false negatives (messages overlooked and still presented in the user’s inbox).
Educate users over the vulnerabilities facing email messages. ¾ Educate users to choose the most appropriate means of communication for a message. ¾ Unless you have the ability to encrypt end-toend communication, assume that messages leaving the organisation can be seen and even altered by third parties. ¾ Ensure employees are aware of web browser security functionality, and in particular are familiar with the certificate warnings (and their implications) in their chosen browser. 54 CHAPTER 5: SERVER SIDE SECURITY This chapter considers the risks faced by e-mail servers at all levels, from organisational servers through mail relays to the recipient’s server.
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. Host resolving: Another simple filtering mechanism uses the Domain Name System (DNS) Message eXchange (MX)20 records to determine if the sending host has an appropriate MX entry.
E mail Security A Pocket Guide by Paul Dowland, Steven Furnell, Paul Dowland