posted
Well, technically, it's my ISP's fault. But not really. They subscribe to a service that puts out a list of those server URLs that have been used by spammers as origination points. Then, they choose to set their filtering to block ANY messages from those servers, not just stuff that looks like SPAM.
For a business, it's fairly disturbing actually, because it means we don't get e-mails from clients who happen to use a particular ISP and have the ill-fortune to have a message routed through that particular blacklisted server.
Sometimes it's really bad because the sender doesn't even get a message saying that the message was blocked or returned. It just goes off into the ether and nobody knows that their message didn't get through.
I'm not very pleased about it, but I don't see our ISP changing their policy any time soon. It's their only way to effectively punish ISPs that don't monitor and control spam.
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