[exim] +ignore_unknown and dns defers (2 part)

Hi !!

It also looks like dns_again_means_nonexist has little effect
and does not solve the problem:

>>> check hosts = +ignore_unknown : *.$sender_address_domain
:$sender_address_domain : ${lookup dnsdb{>:
defer_never,mxh=$sender_address_domain}}
>>> cioce.com in dns_again_means_nonexist? yes (matched "cioce.com")
>>> no IP address found for host cioce.com (during SMTP connection from
smtp.telefonica.net (ctsmtpout1.frontal.correo) [213.4.149.66])
>>> host in "+ignore_unknown : *.cioce.com :cioce.com : "? lookup
deferred for cioce.com
>>> accept: condition test deferred
>>> deny: condition test deferred
>>> drop: condition test deferred
451 Temporary local problem - please try later


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