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Old 14th December 2009
BSDfan666 BSDfan666 is offline
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You should typically avoid _'s entirely, some resolvers support them.. others do not, and traditionally they're not acceptable in Unix hostnames either.

It's like the '-' character, some combinations are invalid as per the specifications.. like -joe-.userdom.com is not valid on standards complaint systems, but it is on Windows/Linux and OS X.
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