Issue #17800 has been updated by jeremyevans0 (Jeremy Evans).

Status changed from Open to Third Party's Issue

Looks like you are referring to the mail gem, which is not part of Ruby itself: https://github.com/mikel/mail/blob/8fbb17d4d5364c77cc870769d451bc2739b3a8ce/lib/mail/network/delivery_methods/smtp.rb#L112

You could try submitting an issue to that project: https://github.com/mikel/mail/issues

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Bug #17800: Cannot disable SMTP TLS through mail library
https://bugs.ruby-lang.org/issues/17800#change-91534

* Author: MarkTheStrange (Mark Reed)
* Status: Third Party's Issue
* Priority: Normal
* ruby -v: ruby 3.0.1p64 (2021-04-05 revision 0fb782ee38) [x86_64-darwin19]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
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Net::SMTP now defaults to automatic TLS; the **mail** interface hasn't been updated to reflect this. It will turn TLS on or to automatic if requested, but has no way to turn it off if requested, because it assumes that it defaults to off in Net::SMTP.

The **build_smtp_session** method should probably call both  **smtp.disable_tls**  and s **mtp.disable_starttls** before checking its parameters to see if it needs to turn either of those back on.




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