Email Issue: com.sun.mail.smtp.SMTPSendFailedException: 451 5.7.3 STARTTLS is required to send mail

I have an issue with configuring smtp office 365:
my config:

image

I’m getting the this error:
image

Hello, maybe this can help:

Tell us how is it going and what did you do to work it out.

Hi,
Have you tried to restart the server? It is sometimes required after changing the email sending settings.