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https://issues.apache.org/jira/browse/EMAIL-105?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13092540#comment-13092540
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Siegfried Goeschl commented on EMAIL-105:
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Hi Bruno - thanks for the detailed explanation since I was not aware of the
details
> Clarify names for SSL and TLS
> -----------------------------
>
> Key: EMAIL-105
> URL: https://issues.apache.org/jira/browse/EMAIL-105
> Project: Commons Email
> Issue Type: Improvement
> Reporter: Bruno Harbulot
> Assignee: Siegfried Goeschl
> Attachments: ssl-starttls.patch
>
>
> The API offers two categories of settings for the configuration of SSL/TLS:
> {{setSSL}} and {{setTLS}} (and respective associated methods).
> The names are quite misleading, as this doesn't really oppose SSL and TLS. A
> number of e-mail applications make this mistake, but "TLS" is used here to
> mean "using STARTTLS" and "SSL" is used here to mean "SSL or TLS, upon
> connection".
> The difference is that:
> - With "SSL" (as incorrectly named here), the SMTP client connects to the
> SMTP server on a dedicated port and starts the SSL/TLS handshake upon
> connection. This is then followed by "normal" SMTP traffic on this SSL/TLS
> layer.
> - With "TLS" (as incorrectly named here), the SMTP client connects to the
> SMTP server on the same port as it would do for plain-text SMTP, exchanges a
> few SMTP commands, including [STARTTLS (RFC
> 3207)|http://tools.ietf.org/html/rfc3207 ], and then starts an SSL/TLS
> handshake to upgrade to a secure channel.
> This is not so much a difference between SSL and TLS, but rather a difference
> regarding when the connection is turned into a secure one.
> The difference between SSLv3 and TLS 1.0 is mostly a version difference,
> where SSLv3 is the predecessor of TLS 1.0.
> You can have an TLS 1.0+ upon connection, using the "SSL" setting, without
> using {{STARTTLS}} (it's a version configuration up to the {{SSLEngine}} or
> {{SSLSocketFactory}}).
> Similarly, although it's not written in the specification, some servers seem
> to accept an SSLv3 handshake (instead of its successor version: TLS 1.0)
> after {{STARTTLS}}.
> I'd suggest deprecating {{setSSL}} and {{setTLS}} and replacing them with
> {{setOnConnectSSL}} and {{setStartTLS}} (or similar), respectively.
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