Issue #15769 has been reported by knu (Akinori MUSHA).

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Bug #15769: Backport r67563: SNI is not enabled in Net::IMAP
https://bugs.ruby-lang.org/issues/15769

* Author: knu (Akinori MUSHA)
* Status: Open
* Priority: Normal
* Assignee: naruse (Yui NARUSE)
* Target version: 
* ruby -v: 
* Backport: 2.4: REQUIRED, 2.5: REQUIRED, 2.6: REQUIRED
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Net::IMAP should enable SNI for it to be able to connect to SNI enabled servers like imap.gmail.com. (Gmail started to require SNI last year)

This problem is exposed when the underlying SSL library supports TLSv1.3, such as OpenSSL >=1.1.x.



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