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The Authlogic::Regex.email allows 'tom.grundström@avaus.fi' as a valid email.
Cannot reproduce this.
However, apparently there is some activity to permit non-ascii characters in email addresses:
There's even new top level domains like .みんな that are perfectly valid for email addresses.
If the defaults don't suite you, you can always disable Authlogic's validation and do your own:
acts_as_authentic do |c|
c.validate_email_field = false