You need to use OAuth 2.0
http://googleonlinesecurity.blogspot.ca/2014/04/new-security-measures-will-affect-older.html
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Jason Hendriks on "[Plugin: WP Mail SMTP] Email could no be sent"
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You need to use OAuth 2.0
http://googleonlinesecurity.blogspot.ca/2014/04/new-security-measures-will-affect-older.html