Erreur mail test smtp

hello, when I want to send a test email from NC it gives the error: The email could not be sent. Check the mail server log.
sorry I’m a beginner.

Please allways check infos like this:

if you have access to a terminall compare the result from:

sudo -u www-data php occ config:list --private |grep "\"mail_s"

with the infos from your email provider. Be accurate and have fun :wink: