In filter_end, I want to know whether reverse DNS lookup had succeeded. So I check the value of $RelayHostname. The man page says that it "May be undef if host name could not be determined". But in my case, (when reverse DNS fails) the value is IP address surrounded by square brackets. Of course, I can check for this, but is this behaviour guaranteed? Can anyone please explain what determines the value of $RelayHostname? Thanks.
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