XenForo does accept invalid email adresses

[PracticalBot]

XenForo does accept email adresses like 1@1.1.

Such an email ist invalid because 1.1 ist not an IPv4 address, not an IPv6 address and not a valid FQDN:

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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('1@1.1', FILTER_VALIDATE_EMAIL));

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