[SA-exim] "Couldn't get Connecting IP header X-SA-Exim-Connect-IP" error message

[Matt Bostock]

Hello,

I'm running SA-Exim from FreeBSD ports. I think I've got everything covered but
I keep getting this in /var/log/maillog:

Dec  7 07:19:57 hostname spamd[93251]: Couldn't get Connecting IP header
X-SA-Exim-Connect-IP for message , skipping greylisting call

It's happening for every incoming message; how can I fix this?

Any help is very much appreciated.
Many thanks,
Matt