Hi @Marcio Ribeiro ,
Welcome to our forum!
However, I can't send any new email (the send button is not enabled) or answer
Based on my test, i can send email successfully in my New Outlook for Mac, the send button is as shown in the below figure:
Do you mean the Send button is greyed out? If so, please first type some words in the email body and check if the send button is enabled.
If not, please provide a screenshot of the issue for our better research. (To avoid privacy leakage, please remember to hide your personal information.)
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.