Articles Tagged ‘email security’

Blacklisting – What it is, its Dangers, and Prevention

Wednesday, February 3rd, 2010

What is it?

Blacklisting is a word that’s commonly thrown around in the e-mail spam filtering world, so I figured I’d shed some light on what exactly it is. Those on the blacklist have their email blocked. “Blacklists” also go by a couple other names, such as: DNSBL (DNS-basedBlackhole List) and Block List. These lists are comprised of the IP addresses of computers and networks that have been linked to spamming, and are constantly updated. Most blacklists block at the server (IP address) level and not the individual e-mail address. Thus, if one email address in your organization gets flagged, then you run the risk of having all of your email addressed flagged. Typically, spam-filtering software, such as ourProSpam e-mail filter, can be configured to access these lists and automatically reject or flag e-mails from domains on these lists.

Who they target
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