[exim] acl_check_mail problem

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Author: Dermot
Date:  
To: exim-users
Subject: [exim] acl_check_mail problem
Hi,

Exim 4.69

We are currently suffering from a network outage on our leased line
and have attempted to fail-over to our secondary exim4 MX that sits on
a ADSL line but have hit a problem.

The secondary server used to make callbacks to the primary for rcpt
authentication but something is stopping it from working. The primary
can be resolved from the secondary.

The logs are full of the messages like these:

unknown ACL verb "acl_check_mail" in "acl_check_mail"
2011-10-04 10:53:47 H=mail3077.email.yousendit.com [208.95.133.69]
temporarily rejected MAIL
<v-bpckdg_blgmoill_bokpalp_bokpalp_a@???>:
unknown ACL verb "acl_check_mail" in "acl_check_mail"
2011-10-04 10:53:49 H=col0-omc3-s4.col0.hotmail.com [65.55.34.142]
temporarily rejected MAIL <debralynn22@???>: unknown ACL verb
"acl_check_mail" in "acl_check_mail"
2011-10-04 10:53:54 H=hktmta23-fen.aics.ne.jp [157.205.202.39]
temporarily rejected MAIL <j.andoh@???>: unknown ACL verb
"acl_check_mail" in "acl_check_mail"
2011-10-04 10:53:55 H=exchange1.tylerisd.org (ExchangeHub.tisd.local)
[66.76.66.163] temporarily rejected MAIL <Linda.Little@???>:
unknown ACL verb "acl_check_mail" in "acl_check_mail"
2011-10-04 10:53:55 H=mx54.emc1.co.uk [212.50.164.244] temporarily
rejected MAIL <bounce@???>: unknown ACL verb
"acl_check_mail" in "acl_check_mail"
2011-10-04 10:53:56 H=blu0-omc1-s17.blu0.hotmail.com [65.55.116.28]
temporarily rejected MAIL <aristrosscleaning@???>: unknown
ACL verb "acl_check_mail" in "acl_check_mail"

Can anyone offer any advice? I am not very familiar with Exim these
days so I am a bit lost at where to begin.
Thanks,
Dermot.