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https://dausacker.wordpress.com/2014/...dica-de-provedores-de-e-mails-seguros
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https://blog.returnpath.com/how-to-explain-dkim-in-plain-english-2
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https://wikileaks.org/DKIM-Verification.html
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https://en.wikipedia.org/wiki/DomainKeys_Identified_Mail#Non-repudiability
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