dovecot TSL 1.3 config option 'ssl_ciphersuites' causes fatal error on launch. not supported, bad config, or bug?

[PGNet Dev]

On 9/23/20 11:29 PM, Aki Tuomi wrote:
> The config option is still missing, but it's in our backlog along with other stuff we would like to add.

Is that pegged to any version/milestone yet?

In the meantime, what state is Dovecot's cipher support IN?
What behavior should be expected when (all of our) other/external services are offering/using/expecting TLSv1.3 ciphers?

A clean fallback from Dovecot to v1.2 protocols/ciphers?

&/or must TLSv1.3 be _explicitly_ disabled/excluded in Dovecot configs?