I managed to send emails from the CRM, but the main problem was my server blocking ports for sending via SMTP.
I couldn't send emails from Digital Ocean, so I migrated to another VPS that allowed me to send emails without any issues.
Another option if you have trouble sending emails is to use third-party services. In my case, Amazon SES worked.
33ebad1e-3ce8-43c4-b601-1c7f37f2a423-image.png