Farelf Posted February 22, 2008 Share Posted February 22, 2008 We usually talk just about "ISP" and "user" filtering. A great many corporate users use MS Exchange and associated products. The following is a synopsis (with further links) of the state of play concerning email filtering in such an environment. Six layers, no less. Well, many would use less than six layers actually but ... I am faintly amazed anything gets anywhere anytime without (instead) meeting a silent death: http://searchexchange.techtarget.com/generic/0,295582,sid43_gci1301525,00.html So, the reasons for occasionally delayed delivery etc. are not too hard to understand when the path of a message through such a mill is considered. Note there is an advantage in using Outlook to mail a recipient in some cases (which probably include many/most of the major corporates). All necessary because of the spammers (emitting 95% + of message volume). The most complicated and costly "band-aid" in the history of communications technology and process. I wonder how many tons of CO2 a day that all adds up to? And getting worse each day. Most of populace is unbothered - not unlike boiled frogs, I guess. Link to comment Share on other sites More sharing options...
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