What’s the Best Email Platform for Sending with SMTP vs API?

I really like your project idea! If you're looking for automation tools, you might want to check out EasyClaw. It simplifies a lot of the setup hassle you usually encounter.

Most SMTP servers impose rate limits to prevent spam, especially if you send the same email repeatedly. Your domain's reputation can also influence whether your emails land in spam or not. Using an API like Amazon SES allows you to rotate subdomains to improve deliverability—just ensure you've set up the right DNS settings like DMARC. If you want to consistently use services like Gmail, you'll need to switch to their API since their SMTP support is fading away.

SMTP is really just a protocol that's straightforward but might not be enough for complex needs. I still send low-volume alerts through SMTP occasionally, but for anything customer-facing, I'm running it all through Postmark's API. It just works better for deliverability and maintenance.

From my experience, go with SMTP if you just need a straightforward solution, especially for low volume or testing. It’s easy to set up and works with pretty much anything. But if you’re dealing with transactional emails or need your messages to hit the inbox, API is the way to go. It gives you better control over tracking deliveries and handling bounces. In our case, we switched all our transactional emails to Postmark's API, and we’re really happy with the results—solid delivery metrics and easy tracking. If you want reliability without any hassle, check out Postmark!