smtp configuration issue

Hello Team!
What a fantastic solution you have!
I’ve self hosted plausible on a dock container and I’ve setup the smtp as follows: https://plausible.io/docs/self-hosting-configuration

But i can’t receive any email notification:

here are my settings (working with uptime kuma self hoted)
Authentication = enabled
Registration = enabled
Mailer Email = [email protected]
SMTP Host Address = myprovidersmtpaddress
SMTP Port = 465
SMTP Username = [email protected] 
SMTP Password = mypassword
SMTP SSL = enabled
SMTP Retries = 2

but nothing works.
I’ve tried to look for a solution all over the place and would really appreciate any direction/

Looking forward reading you.
Ludo