[Bug Infrastructure/29713] Please make libc-alpha mailing list compatible with “git am”

["mark at klomp dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29713

--- Comment #23 from Mark Wielaard <mark at klomp dot org> ---
filter_content is set to No.

But looking around it seems 8bit content transfer encodings are problematic
with DKIM signing in general. The spec says before signing a message 8bit
content should be transformed to a 7bit encoding so the signature survives if
any transport doesn't support the 8bit encoding. So it could be said this is
just an issue with the mimecast dkim signing in the above case, since it
doesn't know that the full transport to the end user is 8bit clean, it should
have transformed to a 7bit encoding itself before signing.

There is a postfix setting that seems to try to keep the 8bit content transfer
encoding even if a transport doesn't explicitly say it supports 8bit encodings:

http://www.postfix.org/postconf.5.html#disable_mime_output_conversion

   Disable the conversion of 8BITMIME format to 7BIT format. Mime output
conversion is needed when the destination does not advertise 8BITMIME support. 

This is recommended for postfix filters and milters to avoid breaking DKIM etc.
signatures:
https://www.postfix.org/MILTER_README.html#workarounds
https://www.postfix.org/FILTER_README.html#advanced_filter

So we probably just need to set disable_mime_output_conversion=yes and hope
that any further transports do actually support 8BITMIME.

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