Version 2.2.0 is available upstream. Please consider updating! It seems that version 2.2.0 is available upstream, while the latest version in the Gentoo tree is 1.1.0. You think this warning is false? Read more about it here.
Validate an email address using three techniques:
* Ensuring that the length of local and domain parts is within the
RFC-specified limits.
* A syntax check using a regular expression, or the full RFC 5322
grammar.
* Confirmation of valid MX records (or, optionally, 'A'
records) for the domain.