LetterStack - Templates, sending, and logs - without the $20/month markup
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Transactional email APIs are convenient until free tiers cap daily volume - or you pay for SMTP you already have. LetterStack is the developer layer on your own SMTP: Handlebars templates, one REST send endpoint, send logs. Connect Gmail, Amazon SES, Zoho, or self-hosted. Your SMTP, your reputation. No volume caps from us. From $1/mo. First month free through June 30, 2026.
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Hey PH - I'm Orkhan, maker of LetterStack.
Every side project needs transactional email. Managed APIs (SendGrid, Mailgun, Resend, etc.) bundle SMTP with templates + API + logs - free tiers often cap daily sends; paid tiers add cost even when you already run Amazon SES or SMTP on a VPS.
I kept rebuilding nodemailer + Handlebars + a send log in every repo. LetterStack is that shared layer on YOUR SMTP:
• Handlebars templates (dashboard + API)
• POST /v1/emails/send with template + variables
• Send logs for debugging
• No volume caps from LetterStack (your SMTP provider's limits apply)
Pricing: Hobby $1/mo · Starter $5 · Pro $9
Launch promo: first month free on any plan - through June 30, 2026
Try it: https://app.letterstack.dev/register
Website: https://letterstack.dev
Our roadmap: https://letterstack.productdesk.dev
Happy to answer SES setup, deliverability, or BYO-SMTP tradeoffs. What do you use for transactional email today - managed API or your own SMTP?