On 18-Jan-2010, at 11:37, Victor Duchovni wrote:
> This thread is NOT about address validation, it is about automatic
> whitelisting of addresses (as senders) that are observed in outgoing
> mail as recipients. No validation is required.
This should be pretty easy to add into a greylisting service or even something
like pop-before-smtp (I think it could very easily be modified, it's already
scanning the maillog).
As for bypassing all the anti-spam checks, just put this check high in your
list so that it is run before other checks.
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