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A comment on Mail-in-a-Box – one-click, easy-to-deploy email server. Parent comment

Re:Mail-in-a-Box – one-click, easy-to-deploy email server by Whitestrake on Monday November 28, 2016 @06:53PM (#13059463)
LetsEncrypt actually has multiple options available for validation. Only one challenge type, http-01, requires port 80 to be open. Another, tls-sni-01, requires port 443. dns-01 requires configuration of your DNS provider. I personally make use of tls-sni-01 and dns-01 in different situations.
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