Recalling this now, I've just done a grep for BOFHBADMIME in /etc/ courier, and I currently have it set in two places:
1. in /etc/courier/bofh, with a line opt BOFHBADMIME=accept
2. in /etc/courier/esmtpd, with a line BOFHBADMIME="accept"
Clearly, one of these two is spurious. I'm pretty sure the bofh file was the one I touched most recently, thereby suggesting that the setting in esmtpd is having no effect... but I don't feel like shaking up my mail conf right now just to find out.
The bofh file sets the BOFHBADMIME as the global default.
In the esmtpd file, BOFHBADMIME gets set for all incoming ESMTP connections, which may be different than the bofh file default.
Alternatively, BOFHBADMIME may also be set in the smtpaccess file, on a per-IP address basis.
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