SMTP sending email functionality is not working

Hi I am sending email to user those who onboarded from api.
but my smtp not working on port 465 or 25.
Do I need to set anything in fly?

Thanks in advance.

Give more info. Where is your smtp server ? Is it open ? What did you try to solve it.

Fly is a docker based service, you need to install or have a smtp server somewhere, I suppose.