Wietse Venema via Postfix-users:
> Andreas Kuhlen via Postfix-users:
> > I have two mail servers that use different content transfer encodings
> > for the same content. Based on the configuration, I can't work out
> > why this is the case.
>
> When Postfix bounces an 8bitmime message, then the bounce message
> will also be 8bitmime.
>
> Otherwise, the encoding is chosen by the mail sending software,
> and Postfix is just the messenger.
The Postfix SMTP client will by default convert 8bitmime to
quoted-printable, if it sees that the next-hop MTA (or SMTP-based
content filter) does not announce 8BITMIME support in the EHLO
response. That is controlled with:
disable_mime_input_processing
disable_mime_output_conversion
Postfix may also be configbured to forcibly convert 8bitmime to
quoted-printable. That is controlled with:
disable_mime_input_processing
force_mime_input_conversion
I wrote that code over 20 years ago, so there may be more details
that I forget to mention.
Wietse
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