F=b
Add a blank line after message V8.6 and later
Some Unix mailbox formats require a blank line at the
end of one message and before the start of the next
message. If your local version of
/bin/mail does not ensure
that this blank line exists, you can use the
F=b delivery
agent flag. If this delivery agent flag is specified
and if the message being sent to the delivery agent
lacks a blank line at the end,
sendmail adds one. This
delivery agent flag is also appropriate for use with
the *file*
delivery agent.
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