[exim] Follow up to hole in bucket message

There is a spam-blocking scheme where you allow users to opt in or out of SMTP
rejections. This is done by deferring at RCPT TO time any users who have opted
differently from the first recipient. So, at DATA time you can to accept or
reject all recipients which did not defer because they have all opted the same
way. You expect the other recipients to arrive in a re-try later.

Is this widely used? Are there any significant reasons for not doing it?

Phil.
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Phil Chambers (postmaster@???)
University of Exeter