On 7. Oct 2020, at 17.35, Olivier Cailloux <olivier.cailloux@dauphine.fr> wrote:

So far I didn’t find a service provider providing free e-mail accounts
(similar to GMail, Yahoo, …) and using Dovecot, which I find very
surprising, as I thought some of these big names, or at least some
smaller ones that I do not know, would use Dovecot.

There is always mailbox.org available that runs on dovecot. Not free, but 1€/month
is not far from that.

Sami