edit appsettings.json, use your own credentials
"EmailValidation": { "EMAIL_API_KEY": "YOUR_API_KEY", "EMAIL_API_URL": "https://emailvalidation.abstractapi.com/v1/" }, "EmailingService": { "EMAIL_FROM": "YOUR_EMAIL@DOMAIN.COM", "SMTP_SERVER": "SMTP_SERVER_ADRES", "SMTP_USERNAME": "YOUR_EMAIL@DOMAIN.COM", "SMTP_PASSWORD": "YOUR_EMAIL_PASSWORD", "SMTP_PORT": 2525 },