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Your ISP and Spam FiltersUnlike the Post office, your ISP is under no obligation to actually deliver your email to you. They can deliver whatever they want, block whatever they want, and send whatever they want to a spam folder. Understand these three conditions.
ISPs blocking emailSome ISP's subscribe to many lists of "known spammers" and simply block and discard any email from any address on any of those lists. Most of those list owners are legitimate and conscientious and work hard to maintain an excellent list. Other's have lousy lists and provide no way to remove yourself if somehow you were incorrectly put on such a list. My IP address was put on one such list and they will not communicate with me at all. They will not tell me why my name is on the list or what can be done to remove it. Canby.com subscribes to that list along with many other lists, so I frequently have trouble sending mail to any of my clients in Canby. Sadly, there is often nothing that can be done if they discard emails from your vendors or clients who were put on any of 30 or 40 lists maintained by someone who refuses to respond to false listings. I have never found an ISP who would stop subscribing to a list simply because it was incompetently maintained and provided no way to remove a name falsely added.Usually it is possible for you to whitelist an address so that will override the email blocking. If this is happening to one of your clients or vendors, try and work with your ISP to whitelist that sender and to help that sender get his name off the list. More than once I've had one of Comcast's servers get on a list, because someone using that server was reported as a spammer. Comcast can normally get their server removed pretty quickly, but smaller businesses often have much more trouble.
Email Spam Filtering Unfortunately there is no perfect way to be sure an email is spam. Really good spam filters catch nearly all your spam and very rarely think good email is spam. For a long time I recommended that my clients simply disable their ISP's spam filtering because some ISP's are incompetent. I recommended that my clients handle their own spam filtering.
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