Mail::SRS::Guarded(3pm) on Linux

The text fad86da9b791, as Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze) shipped it.

A guarded Sender Rewriting Scheme (recommended)

Mail::SRS::Guarded(3pm) on Linux now