eximconf: re-order checks to avoid unnecessary DNS lookups
authorAdam D. Barratt <adam@adam-barratt.org.uk>
Sun, 27 Oct 2019 20:53:42 +0000 (20:53 +0000)
committerAdam D. Barratt <adam@adam-barratt.org.uk>
Sun, 27 Oct 2019 20:53:42 +0000 (20:53 +0000)
If the result of the DNS lookup is not going to be used, then we may as
well not perform the lokup at all

Signed-off-by: Adam D. Barratt <adam@adam-barratt.org.uk>

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