On 2012-03-12, at 9:05 AM, Lyndon Nerenberg wrote:
Since these headers will be specific to the backend transport I would suggest
ignoring ones unknown to the backend, and giving the backend the ability to
print warnings, or abort the send, if there are problems processing a
recognized directive.
The sender should also be able to specify the message not be sent if a
meta-directive cannot be honoured. E.g. trying to specify deliver-by when
using the sendmail transport. Changing <directive> to:
directive = LETTER *(LETTER / DIGIT / "-") *("!")
would make
.deliver-by 86400 N
a request, and
.deliver-by! 86400 N
a demand.
--lyndon
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