[Exim] failed to find host name from IP address

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Autor: Hochstrasser Benedikt
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A: exim-users
Assumpte: [Exim] failed to find host name from IP address
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Today I see in my logs an increased number of rejections because of
"failed to find host name from IP address". While this is perfectly fine
when dealing with spammers I have the uneasy feeling that exim sends a
reject upon every kind of DNS failure. (some of the DNSes I tried
managed to resolve the IP in question while others didn't).

Or can someone confirm that eg. upon DNS time-outs exim sends a 451 (?)
temporary error message instead of a 550?

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Ben
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