How many messages do you get a day? 20, 50, 100? Think again. On average, I get between 200 to 400+ e-mails/day. When spammers point their big guns at me (which happens occasionally) I can get as many as 600-800+ messages per day.
This screen shot from my PerfectMail daily Activity Report e-mail for Nov 19, 2013, and tells me that 49 messages (about 20%) were wanted/delivered. The rest of the messages were blocked as spam.
I could go on about the productivity waste of having to manually screen almost 200 spam messages... but that's what a spam filter is for. Let's take a look at how well PerfectMail does it's job.
Q. How do we find the 49 wanted messages out of all that clutter?
A. By applying a series of progressively more sophisticated real world tests designed to identify dangerous and unwanted messages.
Malicious e-mail is any message that contains a payload (e.g.: attachment) that is designed to harm you or your computer. PerfectMail deals with these messages in 2 ways:
These tests that reject unwanted messages with very level of confidence. In my case, PerfectMail stopped 14 malicious messages.
Sometimes, you just don't want to talk to somebody. PerfectMail takes the same attitude against known spam sources. PerfectMail works with multiple Black List sources to safely reject e-mails from known spam senders. A Black List is a service that safely identifies spam sources by prior activity. These usually include:
PerfectMail can work with multiple sources for unwanted sender information. By default, it queries spamhaus.org but can be configured to use other sources. By safely eliminating messages from known spam sources, PerfectMail safely eliminated 128 messages from my inbasket today.
Why is Outbound e-mail in my daily activity report? Because this information can be very useful. With this information, I can:
But clearly this doesn't affect my inbound e-mail... so let's move on.
Mail that gets through initial checks (i.e.: does not contain a virus and does not originate from a known spam source) is subject to a wide range of additional checks. In a nutshell, these tests:
While all of the above tests are important, the last item is especially so. Spammers usually craft their content to have you take some action (buy something, contact the Nigerian 419 scamer, visit an infected web site, steal your personal information, etc.).
To protect against these threats, PerfectMail includes the usual suite of content tests including:
But, PerfectMail also has some very exciting (and fully automated) features to help correctly identify and block spam. Here are just some of it's capabilities:
PerfectMail placed 39 messages into our quarantine due to content related concerns.
Through a combination of tests, from basic to advanced, PerfectMail thoroughly examines all aspects of an inbound message. Messages are scored when we see questionable behavior (attempts at abuse or not following e-mail best practices). If a message score exceeds a preset maximum, the message is saved in the quarantine and not delivered to the recipient.
To protect against false positives (incorrectly blocking wanted e-mail), PerfectMail keeps a copy of all content blocked messages in a local message archive. It sends all protected users daily activity reports with a list of all blocked messages. From these reports, users can review and release wanted messages from the quarantine.
How effective is the quarantine? My experience is typical of most PerfectMail users. In a normal week, I release no more than 2-3 messages from the quarantine (out of 1,750+ (7 days x 250 messages/day)). This yields an accuracy rate of about 99.8%
My inbox is clean and uncluttered with spam. Because of PerfectMail's very high accuracy rate, I spend my precious time on valid e-mails and not rummaging through the quarantine.
-- Larry Karnis