On Tue, Jul 18, 2023 at 01:43:46PM +0200, Tinne11 via Postfix-users wrote:
> In order to follow this recommendation, a Postfix MSA (being part of a
> system DKIM-signing outbound messages) needs to be configured to convert all
> submitted 8-bit messages to 7-bit (base64 or Quoted-Printable). Is this
> possible?
Yes, but it requires a (possibly NOOP) content_filter delivery hop,
or equivalently a multi-instance configuratoin with an input and output
Postfix instance. If you force all incoming mail through an internal
SMTP hop, you can do the 8bit -> 7bit downgrade during that delivery,
and delay the DKIM signing until the output instance, which will
always see 7bit input.
--
Viktor.
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