Is the manual wrong about dovecot?

[Christine Lemmer-Webber <cwebber@dustycloud.org>]

The dovecot manual section confuses me.  It says:

>   By default, Dovecot does not need much configuration; the default
> configuration object created by ‘(dovecot-configuration)’ will suffice
> if your mail is delivered to ‘~/Maildir’.  A self-signed certificate
> will be generated for TLS-protected connections, though Dovecot will
> also listen on cleartext ports by default.  There are a number of
> options, though, which mail administrators might need to change, and as
> is the case with other services, Guix allows the system administrator to
> specify these parameters via a uniform Scheme interface.

But later:

> -- ‘dovecot-configuration’ parameter: string ssl?
>     SSL/TLS support: yes, no, required.  <doc/wiki/SSL.txt>.  Defaults
>     to ‘"required"’.

Whew, that's a good default, I think.  But wait, I'm confused... is it
still listen on cleartext ports generally or not if the default is that
ssl is "requied"?

 - Christine