mailmail(1) on Linux
The text 70f089ae4d6b, as Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze) shipped it.
Twisted sendmail compatibility script
The text 70f089ae4d6b, as Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze) shipped it.
Twisted sendmail compatibility script