Shared Unlimited plan has free unlimited mailboxes (no additional payments)?

I saw that in the characteristics of the tariff plans there is such an inscription “Free email hosting is not available for Shared Starter” but you also have a Shared Unlimited plan, what do you think, an unlimited number of mailboxes will be available in this plan - no additional payments?

That’s correct. Shared Unlimited provides unlimited users, MySQL databases, and email accounts for any domains you host within the account.