Wietse Venema via Postfix-users:
> Tinne11 via Postfix-users:
> > Is there some parameter which could have been named
> > enforce_mime_output_conversion in analogy to disable_mime_output_conversion
> > or some other way to configure this?
>
> It would avoid the need for (null) content filters that I discuss
> in my other response. However this is no as simple as it might
> appear to be.
>
> Presently, MIME downgrade is an after-queue feature (i.e. after
> mail is queued), implemented only in the SMTP delivery agent.
>
> On the other hand, DKIM signing must be a before-queue feature (i.e.
> before mail is queued) because the Postfix Milter implementation
> requires that Milters can make changes to queue files. Delivery
> agents must not do such things.
>
> Therefore, downgrade-before-signing would also have to be made
> available as a before-queue feature. Unfortunately I don't have the
> time for doing that.
Turns out that this required very little code (basically one boolean
configuration parameter that controls a bitfield flag that is input
to the Postfix MIME processor. Preliminary manpage text is below.
Wietse
enforce_mime_input_conversion (default: no)
Convert content that claims to be 8-bit into quoted-printable, and up-
date the correspnding Content-Transfer-Encoding: message headers. This
conversion happens before header_checks, before body_checks, before
storing a message in the mail queue, and before applying Milters.
The typical use case is an MTA that signs outbound messages after the
8-bit to quoted-printable conversion, so that the signatures will re-
main valid when a message is handled by an MTA that does not announce
8BITMIME support.
This feature is available in Postfix >= 3.9.
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