Fake smtp server?

Hello, I am using emailvoid.com at the moment. it's exactly what you're searching for -- dummy smtp.?

If you're looking for tools to assist with email testing in a development environment, you can consider:
1. MockSMTP
2. SMTP Bucket
3. SMTPget
4. MailHog

personally, we used SMTPget and Mailhog for the last 8 months, you can choose the tool that best fits into your development workflow.