You are running postfix-3.5.3. This was fixed four years ago in
postfix-3.5.8:
20201104
Bugfix (introduced: Postfix 3.5): the Postfix SMTP client
broke message headers longer than $line_length_limit, causing
subsequent header content to become message body content.
Reported by Andreas Weigel, fix by Viktor Dukhovni. File:
smtp/smtp_proto.c.
Please upgrade your Postfix.
Wietse
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