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Email delivery & product notes

Practical articles for developers and operators sending transactional and business email.

Transactional

What is transactional email (and what is not)?

OTP codes, receipts, and password resets are not newsletters. Learn the line inbox providers draw.

May 2026 · 6 min read Strategy

Transactional vs marketing email: separate streams

Why mixing promos with password resets hurts deliverability — and how to architect two lanes.

May 2026 · 7 min read Deliverability

10 deliverability practices before you scale volume

SPF, DKIM, DMARC, list hygiene, and monitoring bounces before a launch burns your domain.

May 2026 · 8 min read Market

Choosing an email API in India: credits vs platforms

ZeptoMail, SendGrid, Amazon SES, and Mailmatic — what you actually buy with each model.

May 2026 · 9 min read Product

OTP and auth emails: speed, templates, and failure modes

Login codes must arrive in seconds. Design, retry, and fallback patterns that work in production.

May 2026 · 6 min read