TL;DR: Password reset emails were landing in Gmail's spam folder. Not occasionally — consistently.

📖 Reading time: ~31 min

What's in this article

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Resend: New Kid, Built for Developers

Side-by-Side: The Numbers and Dealbreakers

Real Code: Sending the Same Email on All Three

When to Pick What — Match the Tool to Your Situation

I Needed Reliable Transactional Email — So I Tried All Three

Password reset emails were landing in Gmail's spam folder. Not occasionally — consistently. My small SaaS app had maybe 200 active users at the time, and I was getting support tickets every week from people who never got their confirmation emails. The culprit was SendGrid's free tier, which shares IP pools across thousands of accounts. When one of those accounts sends spam, your deliverability tanks too.…