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https://issues.apache.org/jira/browse/VALIDATOR-470?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sebb resolved VALIDATOR-470.
----------------------------
    Resolution: Invalid

123.123.123.123 is not valid as a hostname; the path segments must start with a 
letter according to RFC 1035.

However email@[123.123.123.123] is valid, because that uses the domain literal 
format:

https://tools.ietf.org/html/rfc5321#section-4.1.3

> EmailValidator does not recognize IP-Adresses
> ---------------------------------------------
>
>                 Key: VALIDATOR-470
>                 URL: https://issues.apache.org/jira/browse/VALIDATOR-470
>             Project: Commons Validator
>          Issue Type: Bug
>            Reporter: Lonzak
>            Priority: Major
>
> [email protected]
> is considered an invalid. This is not correct.
> Strangely "email@[123.123.123.123]" is considered to be valid...



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