[Dovecot] Dovecot 'Submission' service?

I do recall this being discussed, but I can't remember if it is actually in a working state now or not.

According to the wiki, it is a work in progress:

http://wiki2.dovecot.org/Roadmap?highlight=%28submission%29

So - is it in a functional state yet?

Thanks,

--

Best regards,

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