> I just sorted this senderdomains list and put it A-Z and now > the top name in the list is showing in the line in the log.
>
> no IP address found for host ACHILDRESS2.COX.NET (during SMTP
> connection from tahini.csx.cam.ac.uk [131.111.8.192])
>
> So it appears that I have something wrong in my exim conf in the acl.
>
> Maybe the last line of it?
>
No, but Exim needs to resolve names into IP addresses and you've got at least two name in there that just don't resolve. A dig of ACHILDRESS2.COX.NET gives an NXDOMAIN response as does a dig of phpbbspprt840.gmail.com.
