check_smtp_settings

svc=account/check_smtp_settings&params={
    "send_from": <text>,
    "send_to": <text>,
    "smtp_host": <text>,
    "smtp_port": <uint>,
    "smtp_login": <text>,
    "smtp_password": <text>,
    "subject": <text>,
    "body": <text>
}

svc=account/check_smtp_settings&params={
    "send_from": "notifications@example.com",
    "send_to": "admin@example.com",
    "smtp_host": "smtps://smtp.gmail.com",
    "smtp_port": 465,
    "smtp_login": "notifications@example.com",
    "smtp_password": "your_app_password",
    "subject": "Test SMTP Connection",
    "body": "This is a test email to validate SMTP settings."
}

svc=account/check_smtp_settings&params={
    "send_from": "notifications@example.com",
    "send_to": "admin@example.com",
    "smtp_host": "smtps://smtp.gmail.com",
    "smtp_port": 465, 
    "smtp_login": "notifications@example.com",
    "plan": "my_billing_plan",
    "subject": "Test SMTP Connection",
    "body": "This is a test email to validate SMTP settings." 
    } 

{
    "error": 250
}