By Jesmond Darmanin
With every advancement in anti spam software, the spammers become more desperate and more inventive. They have even discovered how to take advantage of standard operations of most e-mail servers.
By Christopher Spence
Email encryption is often touted as a means of combating spam. However, encryption alone is not much help in the fight against spam because of the way modern cryptographic protocols use public key encryption. In fact, encryption could conceivably worsen the amount of dangerous spam that gets past a spam filter if the filter cannot decrypt a message and examine its contents. To be useful, encryption must be used in combination with a closely related technology - authentication.
By Ara Rubyan
Outclass
Outclass integrates POPFile’s classification engine into Outlook.
Pros:
* You get an easy to use toolbar that lets you re-classify messages.
* You can set up “buckets” (or categories) easily and have Outclass file or delete matching messages automatically.
* Outclass works with IMAP or Exchange accounts just like incoming POP mail.
By Ara Rubyan
* Identify directory harvesting A Directory Harvest Attack or DHA is a technique used by spammers in an attempt to find valid e-mail addresses. A spammer can easily generate a flood of messages to multiple addresses at (usually) a corporate email server. These servers are likely to have a standard format for official e-mail aliases (i.e., jdoe(at) company.com, johnd(at)company.com, or johndoe(at)company.com). Any addresses that do not generate a “message delivery failed” email are considered to be valid and are added to the spammer’s list. Good anti spam software should be able to detect this flood of emails and quickly block the spammers from swamping the network.
* Automated whitelist As you can imagine, a whitelist is the opposite of a blacklist, i.e., it is a list of domains that send good email, not spam. An Automated Whitelist is a whitelist which is created or maintained by the anti spam software that monitors incoming and/or outgoing email, and based on your standards, will add or remove entries from the whitelist without you having to bother.
* 3rd party DNS blacklist Microsoft Exchange mail servers can compare the routing addresses of incoming emails to a list of servers that spammers are suspected to use. If an email appears to be from a blacklisted server, it is blocked. The advantage to this kind of anti spam solution is that you don’t have to install anti spam software; you just use a DNS blacklist to do the filtering for you. The downside of this solution is that it can block legitimate email if the innocent bystander happens to share space on a server with the spammer — guilt by association, if you will.
* 3rd party URL blacklist Similar to a DNS blacklist. The advantage to this kind of anti spam solution is that it is potentially more precise — it blocks spam from a single URL instead from a single server that may host multiple URLs. The downside is list pollution, i.e., the database may contain URLs that do not send spam. Spammers will do this to render the entire database unreliable and cause its eventual abandonment.
* Customizable policies for groups, individuals Administrators can choose to define their own unique rules and policies for blocking spam that may differ from the rules supported by the particular anti spam solution. Usually this means setting custom content filters based on the subject, message headers, message bodies and attachment file type. The downside (if there is one) is that it takes time to create and implement these custom policies; however, because it is not a pre-requisite, the administrator can simply go with the standard configuration if she wishes.
* Supports foreign language spam For some reason, I get a ton of Russian spam every day. So I’m interested in any anti spam solution that can block and filter foreign language spam. It is relatively easy to do — you simply compile a list of foreign language characters that you want to block, and/or entire languages, and/or countries from which the foreign language spam might originate. The downside to this is that it is a pretty extreme solution, especially if you expect to get the occasional valid foreign language email. If that is the case, your anti spam solution should be able to implement the sorts of techniques for foreign language spam that you would expect in a solution for English language spam.
* Anti phishing Phishing is a criminal activity where a spammer sends you an email pretending to be someone you trust, i.e., your bank, PayPal, eBay, etc. Then, they attempt to get sensitive information from you, like usernames, passwords and credit card details. This kind of spam can be blocked if the anti spam software is equipped to look for certain kinds of links, website forgeries, or JavaScript coding in the body of the email.
By Jesmond Darmanin
Unless you live in a cave –and one without a computer at that– you’re very familiar with the huge time waster that sifting through mountains of email spam can be. And while spam is a huge annoyance for employees and end users everywhere, the real costs for businesses are in time and money and they’re increasing every day. As costs rise, IT people (at SMEs in particular) are desperate for ways to deal with it effectively.
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