[exim] Remote domain not found in DNS

Hi !!

I found a situation where

verify       = header_sender/callout=10s/defer_ok

gives the error

could not verify "From:" header address
550 stefan@???: Remote domain not found in DNS

altough webau1.hostcore.com.au does not have MX records it has
an A record and thus should not give that error.

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Best regards ...

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    David Saez Padros                http://www.ols.es
    On-Line Services 2000 S.L.       e-mail  david@???
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