Mark a sender as legitimate
Currently, when you choose to allow only selected senders or domains, everything else goes to the spam folder. Which is OK.
BUT, today, if a mail is not spam, we can mark it as not spam, but future e-mails will still be marked as spam, as the sender is still not allowed. We have to copy the address or the domain and go to the settings and add it in the list of allowed senders.
There should be an option when you open a spam mail, to add the sender to the authorized senders, so no further mail is redirected to spam.
It could be an option when clicking on the sender, or simply when marking it as "not spam" it asks if we want to add the sender to the list of allowed senders.