Tinne11:
> 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?
Wietse Venema:
> 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.
...
> Therefore, downgrade-before-signing would also have to be made
> available as a before-queue feature.
...
> 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.
This is now included with the Postfix 3.9 development release (i.e.
it will be part of the Postfix 3.9 stable release early 2024. I
changed the name for clarity, and the updated manpage text is below.
Wietse
https://www.postfix.org/postconf.5.html#force_mime_input_conversion
force_mime_input_conversion (default: no)
Convert body content that claims to be 8-bit into quoted-printable,
before header_checks, body_checks, Milters, and before after-queue
content filters. This feature does not affect messages that are
sent into smtpd_proxy_filter.
The typical use case is an MTA that applies this conversion
before signing outbound messages, so that the signatures will
remain valid when a message is later delivered to an MTA that
does not announce 8BITMIME support, or when a message line
exceeds the SMTP length limit.
This feature is available in Postfix >= 3.9.
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