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Country-based DNSBL blocking revisited

Written by Yves Lacombe on . Posted in Email Security & Antispam

Back in 2009, I wrote an article about country-based DNSBL blocking.   You can find the original article here:  http://www.vircom.com/security/country-based-blocking/ Thankfully, the person who runs the countries.nerd.dk blacklist is still around and operational and you can still use their country-based DNSBL zones to block certain countries from sending mail to you. Depending on the type of [...]

Colocation providers – Use them or drop them?

Written by Abderrahim Ibnou El Kadi on . Posted in Email Security & Antispam

IT administrators looking to save money may consider housing the server and equipment in another company’s data center.  As with any decision, there are pros and cons.  In this case there seems to be more advantages to colocation, so let’s take a closer look at why you may choose colocation.  What is a colocation provider? [...]

50 shades of Graymail …

Written by Yves Lacombe on . Posted in Email Security & Antispam

Graymail is basically bulk Email that may have been requested at one point via an opt in but over time, interest in this type of Email has diminished and the end user eventually considers these messages as annoyances or spam.   Another name for it is BACN (Or Bacon). Wikipedia defines Graymail as having the following [...]

Spam filters should be kept outside your network!

Written by Yves Lacombe on . Posted in Email Security & Antispam

If you’re running an exchange server (or any other type of mail server) on-premise, you should consider putting your spam filtering gateway outside your network, either at a co-location (if it’s a physical server), or, if it’s a software package, on a VPS provider (Virtual Private Server). Why? The reason is simple – by doing [...]

Powerall Slim 9000

Written by Jason Carreiro on . Posted in Email Security & Antispam

              I’ve lived in Canada all my life and I know firsthand that during the winter season it can get to a bone chilling -20 degrees or more. Not only do you have to deal with shoveling your car out of the snow, but  you also have to deal with your car battery dying or [...]

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