[exim] no IP address found for host

I keep getting these errors/warnings: "no IP address found for host
relay_from_hosts" in the logs like this...


2021-02-09 11:46:45 SMTP connection from [10.100.7.3]:46172
I=[10.100.1.3]:25 (TCP/IP connection count = 3)
2021-02-09 11:46:45 no IP address found for host relay_from_hosts
(during SMTP connection from (scc) [10.100.7.3]:46172 I=[10.100.1.3]:25)
2021-02-09 11:46:45 1l9HAz-00086j-M3 <= customer.service@***** H=(scc)
[10.100.7.3]:46172 I=[10.100.1.3]:25 P=esmtp S=36031
id=1261380024.6415.1612831605676.JavaMail.root@scc.**** for ****@yahoo.com
2021-02-09 11:46:45 SMTP connection from (scc) [10.100.7.3]:46172
I=[10.100.1.3]:25 closed by QUIT


What does this mean? I don't have any reverse DNS verification enabled,
but is relay_from_hosts a special variable with some hidden meaning in exim?

What I think is the relevant parts of the configuration (and the only
places that relay_from_hosts is used)..


-----

local_interfaces = <; 10.100.1.3 ; 202.167.247.93 ; 2404:4f00:1010:1::25

hostlist relay_from_hosts = 10.100.1.3/16 : 10.101.1.3/16

################
begin acl
################
# This is to allow internal hosts to skip auth
acl_smtp_helo:
   accept  hosts   = +relay_from_hosts
           control = allow_auth_unadvertised
   accept

acl_smtp_rcpt:
   accept
           control       = submission
           control       = dkim_disable_verify

acl_smtp_mail:
accept authenticated = *

   accept  hosts   = +relay_from_hosts
           message = Local address without authentication

deny message = Authenticated or local address required

acl_check_data:
accept

-----