THE BUILDERS’ FIELD GUIDE

A little clarity
goes a long way.

Practical answers for connecting the email inside your product. Start with the setup path, then go deeper where you need it.

START HERE · SETUP

From your first event
to a validated integration.

A real launch checklist: account, domain, template, event connection, scoped key and delivery evidence.

Read the setup guide ↗

DOMAIN & DNS

Ownership. SPF. DKIM. DMARC.

Understand the order of operations and review changes without overwriting your existing email setup.

Read the DNS guide ↗

PROVIDER DECISIONS

Choose an API that fits your product.

A source-linked look at Emailer API, Resend, Postmark, SendGrid, Mailgun and Amazon SES.

Compare email APIs ↗

ANSWERS FOR YOUR NEXT STEP

Build with AI.
Connect your email.

Specific answers for choosing an API, connecting your app, checking DNS and understanding delivery.

PRACTICAL GUIDE

Developer event analytics for a transactional email API

Measure documentation interest, verified setup, queue acceptance and later delivery outcomes without collecting API keys, message bodies or customer identifiers.

ACCOUNT VERIFICATION

How to send an account verification email with an API

Connect an account-verification email to a real signup event with a verified domain, approved template and server-side API key.

AI APP IMPLEMENTATION

How to add email to an AI-built app without exposing API keys

A practical checklist for connecting an AI-generated app to transactional email: server-side secrets, genuine event checks and a reviewed first send.

APPOINTMENT CONFIRMATIONS

Appointment confirmation email API integration: a practical checklist

Send appointment confirmations from a real booking event with a verified domain, approved template and safe retry behavior.

TEMPLATES

How approved transactional email templates work in an API

Choose a fixed reviewed template, supply constrained variables and keep edits separate from send authorization.

SCHEDULE CHANGES

How to cancel a scheduled email API request

Cancel an eligible scheduled message while preserving its audit trail and avoiding a duplicate replacement send.

ASSISTED EMAIL SETUP

Can ChatGPT or Claude help set up transactional email?

What Emailer API’s optional ChatGPT and Claude connections can help with, how account linking works and which setup actions stay in your account.

PRACTICAL GUIDE

Receipts, resets or confirmations: choose your first business email

Choose your first transactional email by the customer action it supports. A practical checklist for receipts, password resets and appointment confirmations.

PRACTICAL GUIDE

Consent-safe developer analytics with Microsoft Clarity masking

Implement consent-safe GA4 and Microsoft Clarity measurement for developer journeys while masking text and excluding customer secrets.

PRACTICAL GUIDE

Developer event analytics for a transactional email API

Measure documentation interest, verified setup, queue acceptance and later delivery outcomes without collecting API keys, message bodies or customer identifiers.

DELIVERY TROUBLESHOOTING

Email API returns 202 but the email is not delivered: what to check

What HTTP 202 means in Emailer API, which delivery signals to inspect next and why a queued response does not establish inbox placement.

PRACTICAL GUIDE

What to measure before you scale a transactional email API

A practical measurement guide for transactional email integrations: separate documentation interest, verified setup, queue acceptance and later delivery outcomes.

DOMAINS AND GOOGLE WORKSPACE

Can you add an email API without changing Google Workspace MX?

Keep Google Workspace receiving mail while adding a sending API. Understand MX, SPF, DKIM and the exact domain needed for event verification.

IDEMPOTENT RETRIES

Email API event idempotency: choose stable keys for safe retries

Design stable event and idempotency identifiers so timeouts and retried requests do not create duplicate transactional emails.

NODE.JS INTEGRATION

Node.js transactional email API integration: a production checklist

Connect a Node.js backend to Emailer API with raw-body signature checks, scoped keys, validation and idempotent retries.

PYTHON INTEGRATION

Python transactional email API integration: a safe first workflow

Connect a Python backend to Emailer API with server-side credentials, event verification and a validation-first send path.

KEYS AND DOMAINS

How to use domain-scoped email API access

Restrict a sending key to one verified domain, keep it off the browser and rotate access without changing tenant ownership.

SUPPRESSIONS

How to suppress a bounced recipient in an email API

Handle bounce and complaint signals with tenant-scoped suppression records and no blind resend loop.

WEBHOOK OPERATIONS

Email API webhook retry handling: make callbacks safe to repeat

Build a webhook consumer that verifies signatures, deduplicates delivery IDs and finishes work within the callback contract.

WEBHOOK SECURITY

Email API webhook signature verification: verify before processing

Verify signed delivery webhooks against the raw request body, reject replays and keep webhook status separate from inbox placement.

CHOOSING YOUR EMAIL API

Free email API for AI-built apps: what to check before choosing

Choosing email for an app built with AI? Compare backend access, supported messages, domain setup and real free-plan capacity before you connect.

PRACTICAL GUIDE

Developer event analytics for a transactional email API

Measure documentation interest, verified setup, queue acceptance and later delivery outcomes without collecting API keys, message bodies or customer identifiers.

PRACTICAL GUIDE

Developer event analytics for a transactional email API

Measure documentation interest, verified setup, queue acceptance and later delivery outcomes without collecting API keys, message bodies or customer identifiers.

PRACTICAL GUIDE

Developer event analytics for a transactional email API

Measure documentation interest, verified setup, queue acceptance and later delivery outcomes without collecting API keys, message bodies or customer identifiers.

PRACTICAL GUIDE

Developer event analytics for a transactional email API

Measure documentation interest, verified setup, queue acceptance and later delivery outcomes without collecting API keys, message bodies or customer identifiers.

PRACTICAL GUIDE

Developer event analytics for a transactional email API

Measure documentation interest, verified setup, queue acceptance and later delivery outcomes without collecting API keys, message bodies or customer identifiers.

NEXT.JS INTEGRATION

Password-reset email in Next.js: a tested event-verification example

Download a runnable Next.js example that checks real customer events, validates password-reset email and keeps sending separate from preparation.

ORDER CONFIRMATIONS

Order confirmation email API: keep receipts tied to real orders

Connect order confirmations to a durable order record and keep payment verification, template approval and later delivery states distinct.

PRACTICAL GUIDE

Does a paid booking need a receipt, an appointment confirmation, or both?

A small-business checklist for separating payment evidence from confirmed bookings, choosing the right Emailer API workflow and handling incomplete transactions.

PASSWORD RESET TROUBLESHOOTING

Password reset email not arriving: an app-owner checklist

Trace a missing password-reset message from the app event through validation, queue acceptance and delivery evidence without creating blind retries.

RELIABLE APP INTEGRATION

How to retry an email API request without sending duplicates

Handle email API timeouts, conflicts and capacity errors with stable event identifiers and idempotency keys, without treating a retry as a new message.

EVENT REVOCATION

How to revoke a transactional email event authorization

Revoke an unused event authorization when an application action is canceled, while preserving the audit record and tenant boundary.

CREDENTIAL ROTATION

Rotate email API credentials without breaking your sending service

Use a staged server-side key rotation with a controlled verification request and a clear rollback path.

SCHEDULED EMAIL

Schedule a transactional email with an API

Use a future schedule only for a real customer event, preserve idempotency and keep cancellation separate from delivery state.

SECURITY ALERTS

How to send a sign-in alert email from an API

Design a sign-in alert workflow with a genuine security event, a reviewed template and delivery evidence that stays separate from authentication logic.

PAYMENTS AND RECEIPTS