Question about '50-user' setting

Tyler Montney <[email protected]>
Newsgroups gmane.mail.virus.amavis.user
Message-ID <CAHXu+W7g5e27Oyq_nRca3n9MfUP_ymj1x+Bt-b4i0G_by9FreQ@mail.gmail.com>
What does “force MTA conversion to 7-bit (e.g. before DKIM signing)” mean?
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