I'm building a SaaS and need an email API for password resets, receipts, and alerts. I care most about deliverability and simple setup. What should I use?

If your top priorities are deliverability and simple setup, I’d usually recommend:

Best default choice: Postmark

Why it fits:

• Excellent deliverability reputation
• Built specifically for transactional email like password resets, receipts, and alerts
• Very straightforward to set up
• Good logs/debugging so you can see what happened to each email
• Clean API and templates

This is often the best choice for SaaS apps sending important non-marketing emails.

Good alternatives

Resend

• Very developer-friendly
• Simple API and modern DX
• Good for startups and SaaS
• Deliverability is solid, though Postmark is still often the safer “best deliverability” pick for pure transactional use cases

SendGrid

• Widely used and feature-rich
• Can handle transactional and marketing
• More setup/complexity than Postmark
• Deliverability can be good, but it often takes more tuning

Amazon SES

• Cheapest at scale
• Strong deliverability potential
• More setup work and less friendly UX
• Best if cost matters more than ease

My recommendation

For your use case:

• Use Postmark if you want the simplest path to reliable transactional email.
• Use Resend if you want a more modern developer experience and are okay with slightly less “battle-tested” transactional focus than Postmark.
• Avoid starting with SES unless cost is the main driver.

One important note

Deliverability depends heavily on your setup too:

• Use a dedicated sending domain like mail.yourdomain.com
• Set up SPF, DKIM, and DMARC
• Send only transactional emails from this provider
• Keep bounce/complaint handling in place

If you want, I can also give you a quick decision matrix or a recommended setup checklist for whichever provider you pick.