Engineering
How to Test Email in Staging Without Sending to Real Customers
Build an email testing workflow with captured messages, recipient allowlists, simulated failures, and controlled inbox checks before a production release.
The SendMero blog
Build better email.
From the first API call to the inbox. Practical guides for the people building what happens in between.
The field guide
20 articles
Deliverability
What Is APRF? Understanding the Proposed Email Feedback Standard
Understand what APRF proposes for aggregate email feedback, its current draft status, and how to evaluate future reports without overstating their coverage.
Deliverability
How to Increase Email Volume Without Damaging Your Sender Reputation
Plan an email volume increase with recipient cohorts, clear pause criteria, authentication checks, and a rollout record your engineering team can actually use.
Engineering
Map Your Email Infrastructure Before the Next Delivery Incident
Create a useful email infrastructure inventory that connects applications, domains, credentials, event consumers, and owners to faster incident diagnosis.
Engineering
Email Operations Beyond the Dashboard: What to Automate and What to Review
Build email operations that combine repeatable diagnostics with controlled changes, clear action plans, scoped credentials, and useful audit records for teams.
Engineering
How to Build Email Tracking Preferences Your App Actually Respects
Turn email tracking preferences into enforceable application behavior across scheduled sends, templates, provider settings, event processing, and reporting.
Deliverability
Your Email Says “Delivered”—So Why Can’t Your Gmail User Find It?
Trace a missing Gmail message from provider acceptance to the mailbox, using message IDs, recipient checks, authentication evidence, and focused escalation.
Engineering
Email Verification Flows: Choosing Codes, Links, and Reliable Fallbacks
Choose an email verification flow that handles multiple devices, delayed messages, expired tokens, and browser experiments without leaving new users stranded.
Engineering
From Product Events to Useful Emails: Building a Reliable Sending Pipeline
Build a product-event email pipeline with durable message intent, current eligibility checks, expiry rules, safe retries, and an auditable path to delivery.
Email strategy
How to Show Your Brand Logo in the Inbox: Apple Branded Mail and BIMI
Compare Apple Branded Mail and BIMI, prepare authentication and brand assets, and build a practical test plan for inbox logos across your sending domains.
Deliverability
Your DMARC Rollout Checklist: From Monitoring to Enforcement
Roll out DMARC with a sender inventory, alignment checks, report reviews, and a rollback plan, with practical notes on the updated 2026 specification.
Email strategy
Why Password Resets and Marketing Emails Need Separate Sending Streams
Separate urgent account messages from marketing email with practical rules for queues, identity, preferences, monitoring, and ownership as your app grows.
Engineering
Build Reliable Email Webhooks: Retries, Duplicates, and Failed Events
Design an email webhook receiver that verifies requests, stores events safely, handles duplicates, and recovers failed processing without losing history.
Deliverability
Your Sending Domain Is on a Blocklist: A Practical Recovery Plan
Work through a domain or IP blocklist incident with evidence: confirm delivery impact, contain the cause, coordinate removal, and verify a controlled recovery.
Engineering
Email API vs. SMTP: Which Should Your Team Choose?
Choose between an email API and SMTP by comparing your application, failure handling, debugging, and migration needs with a practical engineering checklist.
Engineering
Accessible Transactional Emails: Better Receipts, OTPs, and Password Resets
Improve transactional email accessibility with practical checks for readable codes, useful links, receipt tables, screen readers, and images that fail to load.
Engineering
Stop Notification Storms: Rate Limits, Cooldowns, and Email Deduplication
Prevent one noisy application event from flooding inboxes with a practical design for notification identity, shared budgets, cooldowns, expiry, and recovery.
Engineering
An Email Address Is Not a User ID: Handling Address Changes Correctly
Separate account identity from email addresses so changes preserve access, preferences, and delivery history without duplicate messages or unsafe account merges.
Engineering
Build Onboarding Emails That Stop When the User Takes Action
Design onboarding email flows with clear entry rules, fresh eligibility checks, duplicate protection, and exit conditions that respect what users already did.
Email strategy
Beyond Open Rates: Email Metrics That Measure Real User Outcomes
Measure whether email helps users finish tasks with clear delivery stages, cohort-based completion rates, latency, resend demand, and actionable failure signals.
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