releasenotes/notes/add-HostDomain-implement-rfc1033-c985a3054f824e9d.yaml


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---
features:
  - |
    Add ``HostDomain`` to handle address with underscore. Underscore are
    allowed in domain by RFC1033 [1][2][3].

    - [1] https://www.ietf.org/rfc/rfc1912.txt
    - [2] https://www.ietf.org/rfc/rfc1033.txt
    - [3] http://domainkeys.sourceforge.net/underscore.html