Another e-mail problem raised. They can receive but when sending, not all are successful. Some came back undeliverable. Looking at the error message, it clearly stated they were blacklisted that’s why. How do you get blacklisted and who blacklist list you? There are a couple of anti-spam companies that sell this service and filter the messages for you. If you are sending out spam mails these guys can test the origin and it’s not valid it will reject the message but if it’s valid it will allow it for a period of time until it learns more and become aware that it’s spam then it will block your origin based on IP address or domain name. Clever stuff!!!
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