1.3.7 doesn’t accept email addresses with Scandinavian letters in them. http://www.ihanhyväreittiopas.fi/ is a valid domain, but example@ihanhyväreittiopas.fi isn’t accepted by the plugin. At least the characters “äåöÄÅÖ” are affected, and likely many more.
Please see http://en.wikipedia.org/wiki/Internationalized_domain_name#ToASCII_and_ToUnicode for reference.
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