If you are administrating a mail server and use blacklists to block spam, you probably know this problem: from time to time your customers complain that they cannot receive emails from certain freemailers. Most often this happens because a freemailer was abused to send out spam and therefore got blacklisted. This short guide shows how you can
whitelist such a mail server in Postfix to make your customers happy again.
http://www.howtoforge.com/how-to-whitelist-hosts-ip-addresses-in-postfix
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