Suspicion of hacking orange email account

Hello,
I am taking the liberty of sending you this message, hoping that someone can help me.
At the beginning of the week, my Orange professional email account got blocked. So I reset the password, everything okay. Then I notified Orange, who left me a message yesterday saying that my professional email had been hacked, that they had blocked it, and that I needed to change the password. All that’s fine.
The problem today is that I receive emails, but I can't send any. When I try to send one, there's an error message saying "some settings are missing or have been incorrectly specified," so the message doesn't go out.
Additionally, I had installed Thunderbird and synced it with my Orange email, but when I open it now, the synchronization cannot be completed, server inaccessible??? Is it possible that Orange is experiencing a problem, and that I haven't actually been hacked????
How can I verify if it is really a hacking situation? All my addresses are there, no email redirection!!! I just don’t see where the problem could be coming from.

Thank you.