This is somewhat related to:On 19/01/2017 08:53, Petr Bena wrote: Re: How to effectively block communication to all domains except whitelisted?
Since the start of this year, the amount of mail blocked by blacklists has dived from around 70% to around 30%. At the same time, spam that is not from blacklisted servers has rocketed. Presumably this is coming from distributed botnets that never send the same thing from the same place for long.
Given the situation, I'm wanting to mark all mail that is not whitelisted by prefixing *** NOT WHITELISTED *** to the subject line of all mail coming from servers not listed at dnswl.org.
How would I set about doing this?
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