[exim] ARC: How to verify OUTBOUND arc signing for locally g…

I want to verify that the arc signing is happening for my outbound mail.
I see an "exim 38801 - - 1rYEEa-00000000A4g-1GSd ARC: no
Authentication-Results header for signing'
this was mail sent directly to this host and authenticated.

Should I add an Authentication-Results header for mail coming in via
587?

Or am I misusing/abusing ARC?

Thanks!

-- 
Larry Rosenman                     http://www.lerctr.org/~ler
Phone: +1 214-642-9640                 E-Mail: ler@???
US Mail: 5708 Sabbia Dr, Round Rock, TX 78665-2106

--
## subscription configuration (requires account):
## https://lists.exim.org/mailman3/postorius/lists/exim-users.lists.exim.org/
## unsubscribe (doesn't require an account):
## exim-users-unsubscribe@???
## Exim details at http://www.exim.org/
## Please use the Wiki with this list - http://wiki.exim.org/