sysutils/panicmail and boot environments

<https://www.freshports.org/sysutils/panicmail/>

For the penultimate panic: panicmail was received (in my Gmail Inbox).

For the most recent panic: no panicmail in the same Inbox. Might this 
be, because the kernel panicked in a different boot environment? If so: 
will a temporary boot of the environment be enough for delivery of the mail?

From <https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273610#c0>:

> Before the panic: with n265135-07bc20e4740d-b running, I created then 
> mounted n265135-07bc20e4740d-c, upgraded its packages, unmounted then 
> activated the environment, then restarted the OS.
>
> If I recall correctly: the panic occurred very close to the end of the 
> shutdown routine.