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---
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features:
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- |
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Add ``HostDomain`` to handle address with underscore. Underscore are
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allowed in domain by RFC1033 [1][2][3].
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- [1] https://www.ietf.org/rfc/rfc1912.txt
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- [2] https://www.ietf.org/rfc/rfc1033.txt
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- [3] http://domainkeys.sourceforge.net/underscore.html
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