[ruby-core:103821] [Ruby master Feature#17047] Support parameters for MAIL FROM and RCPT TO

Issue #17047 has been updated by xtkoba (Tee KOBAYASHI).


I am sorry that I cannot evaluate the importance of this proposal.

Are there any real-world use cases of `SMTPUTF8` or `REQUIRETLS` or any other optional parameters for `MAIL` or `RCPT` commands?

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Feature #17047: Support parameters for MAIL FROM and RCPT TO
https://bugs.ruby-lang.org/issues/17047#change-91939

* Author: c960657 (Christian Schmidt)
* Status: Open
* Priority: Normal
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## Proposal
In `Net::SMTP`, add support for parameters for `MAIL FROM` and `RCPT TO`, such as [SMTPUTF8](https://tools.ietf.org/html/rfc6531) and [REQUIRETLS](https://tools.ietf.org/html/rfc8689).

I suggest extending `Net::SMTP#mailfrom` and `Net::SMTP#rcpto` so they accept an additional optional Array or Hash of parameters.

For `Net::SMTP#send_message` and `Net::SMTP#open_message_stream`, I suggest that in addition to a String email address (or arrays of Strings), these methods should accept a pair (or arrays of pairs) of `[addr, params]`, where `addr` is the String email address, and `params` is an Array or Hash of parameters.

In order for the parameters to be useful, we should expose the capabilities reported by `EHLO`, so `capable?` should be made public.

Pull request: https://github.com/ruby/ruby/pull/3359



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