Spam control. The IP addresses of known spammers are added to blacklists and blocked from sending mail. People argue about the usefulness of this because these adresses change: new folks get addresses formerly used by spammers and are then blocked.
I think it's a dumb idea for a business to use blacklists. You don't want to block potential customers from sending you mail.
People do disagree on this; it's just my opinion.
Update: since then, blacklists are very common for controlling spam but continue to cause annoyance, mostly from false positives - you get put on a blacklist and therefore cannot send mail.
Kerio Connect Mailserver offers the ability to bump the spam rating score on blacklist hits. This doesn't block outright unless there are other indications of spam. That's a smarter way to handle these.
If you found something useful today, please consider a small donation.
Got something to add? Send me email.
More Articles by Tony Lawrence © 2011-07-06 Tony Lawrence
I've noticed lately that the paranoid fear of computers becoming intelligent and taking over the world has almost entirely disappeared from the common culture. Near as I can tell, this coincides with the release of MS-DOS. (Larry DeLuca)