Have used it for nearly a year. Can’t live without it! I use it in conjunction with another technique: e-mail segregation. Or at least, that’s what I call it. Basically, when I register with a site, I give them a unique e-mail address… like: me.ebay@mysite.com or me.wordpress@mysite.com
I have that e-mail address forward to my main address. Then, I just tell KnowSpam to let pass all e-mails that come to me via those names. That way, if ebay changes their “from” address, it’ll still pass. Sure, I could just give them my real address, and whitelist “ebay.com” but then scammers would get in. If you do this extensively, your e-mail is quarantined. If one of the addresses gets “compromised” you can just delete it. This technique has made me spam free. You just have to make sure that the auto whitelist feature of knowspam isn’t your only line of defense… for instance, put a whitelisted address on your business card… some may think it rude to have their humanity verified when you handed them a card with the address IN PERSON.
Anyway, you should absolutely use the service. Another person who has used the service, and whose opinion I respect is Brad Choate. He’s actually how I discovered the service.
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