In this filter action,
# Delete the body, and add a message
:0 fbi
| echo; echo "Dangerous file attachment deleted."; echo
the first 'echo' is there only for aesthetic reasons. It isn't needed,
because
there will be a preceding blank line already which terminates the
mail header. I added the final 'echo' though with belief that
a well-formed message body must always end with a blank line.
Is that the case? Will procmail add it for me when it delivers
the message, unless I specify 'r' (for "raw") as one of the
action modifiers?
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