RSS Feed/News XenForo accepts invalid email addresses

[ENXF NET]

XenForo does accept email adresses like [email protected].

Such an email ist invalid because 1.1 ist not an IPv4 address, not an IPv6 address and not a valid FQDN:
RFC 3696: Application Techniques for Checking and Transformation of Names

There is an additional rule that essentially requires that top-level domain names not be all-numeric
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PHP's built-in filter methods would correctly reject such an email:
PHP:

var_dump(filter_var('[email protected]', FILTER_VALIDATE_EMAIL));

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