https://www.freebsd.org/cgi/man.cgi?null(4)

[Ralf Mardorf]

Some threads are caught in a dead end, you can safely redirect them to
/dev/null .

Under normal circumstances it's reasonable to read the body of an email
with a subject like "Will FreeBSD migrate away from BSD-style init?" and
to reply. At the moment it's safe to redirect emails with similar
subjects to /dev/null , without even considering to read the emails'
bodies.

Keep in mind that a single human being could act as several provocateurs
using different accounts.