|Always strip headers to 7 bits
||V8.10 and above
Older versions of
sendmail strip only the high bit from header
characters when transmitting an 8-bit message to a 7-bit-only site.
Beginning with V8.10 sendmail, it is possible to
use this F=6 delivery agent flag to force
sendmail to always strip the high bit from all
header characters, no matter what.
This F=6 delivery agent flag is not set by default
for any delivery agent.