Error "error in ACL: unknown ACL condition/modifier in "spam = ${acl_m1}/defer_ok"

[LavenderHost]

Hi

I am getting this error 

Starting exim: 2017-01-18 19:59:22 Exim configuration error in line 518 of /etc/exim.conf:

error in ACL: unknown ACL condition/modifier in "spam =  ${acl_m1}/defer_ok"

I tried reseting the configuration and it is not at all working 

I am not sure what changed in between and I have tried upcp as well and it is not at all fixing :

Any idea on this

---

Hi

When I tried to comment out the lines which is having issue I got another error

Starting exim: 2017-01-18 21:43:20 Exim configuration error in line 1075 of /etc/exim.conf:
authenticator dovecot_plain: cannot find authenticator driver "dovecot"