For anyone still following, a complete script below my signature. No
need for temporary files, let sendmail(1) read the input and handle the
exit code. Relies on bash support for arrays and POSIX "[[ ... ]]"
expressions, including pattern matching when the right argument of "="
or "==" is an unquoted literal string with shell globbing
metacharactesr. The pattern is automatically anchored (must match the
whole left string, not just a substring).
--
Viktor. 🇺🇦 Слава Україні!
#!/bin/bash
PATH=/usr/sbin:/usr/bin:/sbin:/bin
# At least one two arguments assumed, since guaranteed by pipe(8).
#
from="$1"; shift
cmd=( /usr/sbin/sendmail -G -i -f "$from" -- )
replace=( "[email protected]" )
for rcpt in "$@"
do
if [[ "$from" = *@source.example &&
"$rcpt" = *@destination.example ]]
then
cmd=( "${cmd[@]}" "${replace[@]}" )
replace=() # Add replacement just once
else
cmd=( "${cmd[@]}" "$rcpt" )
fi
done
exec "${cmd[@]}"
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