/usr/sbin/qmtpfront-echo is in mailfront 1.16-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 | #!/bin/sh
# WARNING: This file was auto-generated. Do not edit!
exec "$(dirname $0)"/mailfront qmtp echo "$@"
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