A Brief History Of Fiber-Optic Communications Optical communication systems date back to the 1790s, to the optical semaphore telegraph invented by French inventor Claude Chappe... Learn More Optical-Cable Construction The core is the highly refractive central region of an optical fiber through which light is transmitted... Learn More power protection

Software As the flood of spam increases end users are looking for new and more efficient solutions to block spam. In turn software developers are knocking themselves out trying to come up with the killer app that will stop spam forever. For several years now companies have been focusing on faster and smarter software to be installed on your PC or on your servers that will detect spam through increasingly more complex algorithms. The ingenuity behind these products can't be argued with. The problem was that as the spam filters became better so did the quality of the bulk email software used by the spammers. The battle to fight spam was spiralling out of control. Business - Click the link on the left to visit our partner sites under business/finance/loan/mortgage category more 1 2 3 4 5 Computers - Click the link on the left to visit our partner sites under computer hardware/software/peripheral category more 1 2 3 4 5 Internet - Click the link on the left to visit our partner sites under webhosting/webdesign/internet marketing category more 1 2 3 4 5 Software - Click the link on the left to visit our partner sites under software category more 1 2 3 4 5 Web Design - Click the link on the left to visit our partner sites under web design/development category more 1 2 3 4 5 Web Hosting - Click the link on the left to visit our partner sites under web hosting category more 1 2 3 4 5 Web Promotion - Click the link on the left to visit our partner sites under search engine optimization/internet marketing category more 1 2 3 4 5 Web Resources - Click the link on the left to visit our partner sites under other web category more 1 2 3 4 5 Recreation - Click the link on the left to visit our partner sites under travel/hotel/cruise category more 1 2 3 4 5 Casino - Click the link on the left to visit our partner sites under online gambling/poker/blackjack/roulette category more 1 2 3 4 5 Health - Click the link on the left to visit our partner sites under online pharmacy/hospital/health category more 1 2 3 4 5 Shopping - Click the link on the left to visit our partner sites under online shopping/gift category more 1 2 3 4 5 Miscellaneous - Click the link on the left to visit our partner sites under all other categories more 1 2 3 4 5   This is an automated process that they can't possibly monitor manually. Enter challenge response spam email filtering. When using a challenge response system each email address must be authorized to deliver email to you. You can either authorize these email addresses manually by adding them to your challenge response whitelist or the challenge response email server can take care of that for you. The process is simple but incredibly efficient. Spammer sends email Challenge response email server doesn't recognize address so issues a challenge email that must be phyiscally answered by a real human.

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