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由 Achilleas Pipinellis 提交于
Contrary to what the name suggests, PLAIN SMTP authentication is not sent in plain text but is Base64 encoded like the LOGIN method. Their difference is described in the third link below. * https://tools.ietf.org/html/rfc4954 * https://en.wikipedia.org/wiki/SMTP_Authentication * http://www.samlogic.net/articles/smtp-commands-reference-auth.htm
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