Send Email with Next.js Using Volanea
Send email with Next.js using Volanea’s REST API. Handle serverless limits, edge constraints, secrets, retries, and deliverability at scale.
Aug 18, 202622 min read
Deliverability
191 articles on deliverability.
How to Add SPF, DKIM, DMARC, and Return-Path Records in Hostinger
Add SPF, DKIM, DMARC, and return-path DNS records in Hostinger hPanel. Avoid hostname mistakes, verify each record, and improve email delivery.
Aug 18, 202618 min read
What Are Inbound Email Error Messages? Causes, Codes, and Fixes
Learn what inbound email error messages mean, where they occur, how SMTP, DNS, and webhook failures differ, and how to diagnose and fix them.
Aug 17, 202624 min read
How to Send Email on Behalf of Your Customers Safely
Learn how to send email on behalf of customers with custom domains, SPF, DKIM, DMARC, bounce handling, tenant isolation, and testing.
Aug 17, 202622 min read
Raw DMARC Reports API: How to Retrieve, Export, and Parse Them
Learn how to retrieve raw DMARC reports from an API, request XML when supported, preserve originals, parse RUA data, and troubleshoot access.
Aug 16, 202622 min read
Getting Started With DMARC Digests: Configure, Read, and Use RUA Reports
Learn how to configure DMARC digests, receive RUA aggregate reports, interpret SPF/DKIM alignment, and move safely toward enforcement.
Aug 16, 202624 min read
DMARC Untrusted Sources: How to Investigate and Fix Them
Learn what DMARC untrusted sources mean, how to separate spoofing from valid senders, and how to fix SPF, DKIM, and alignment issues.
Aug 16, 202622 min read
DMARC Trusted Sources: How to Identify Legitimate Email Senders
Learn how to interpret DMARC trusted sources, verify legitimate senders, fix SPF/DKIM alignment, and safely enforce DMARC policies.
Aug 16, 202621 min read
DMARC Troubleshooting Tips and Tricks for Reliable Email Delivery
Use these DMARC troubleshooting tips to fix alignment, SPF, DKIM, DNS, reporting, and delivery failures before they affect legitimate email.
Aug 16, 202620 min read
DMARC FAQ: Setup, Alignment, Policies, and Reports
DMARC FAQ for developers: learn record syntax, SPF and DKIM alignment, p=none to reject policies, aggregate reports, and debugging steps.
Aug 16, 202619 min read
How to Update an SPF Record When One Already Exists
Learn how to update an SPF record when one already exists, merge authorized senders, avoid PermError, and validate DNS safely.
Aug 15, 202621 min read
DKIM Record Won’t Verify? A Practical DNS Troubleshooting Guide
Fix a DKIM record that won’t verify: check the selector, DNS host and value, CNAME/TXT conflicts, propagation, signing, and DMARC alignment.
Aug 15, 202620 min read
How Often Should You Generate a New DKIM Key?
Learn how often to generate a new DKIM key, when emergency rotation is required, and how to rotate selectors without breaking email delivery.
Aug 15, 202619 min read
Setting Up DKIM for Your Domain: DNS Records, Testing, and Troubleshooting
Set up DKIM for your domain with correct DNS records, selector guidance, testing commands, key rotation, and fixes for common failures.
Aug 15, 202620 min read
What Is SPF and Why Is It Important for Email?
Learn what SPF is, how SPF DNS records work, why it matters for email security and deliverability, and how to configure and test it correctly.
Aug 15, 202622 min read
How to Fix DMARC Policy Bounces: A Technical Guide
Fix DMARC policy bounces by diagnosing SPF, DKIM, and domain alignment failures, validating DNS records, and safely restoring delivery.
Aug 14, 202620 min read
Troubleshooting 422 Unprocessable Entity Errors in Email APIs
Troubleshoot 422 Unprocessable Entity errors in email APIs with a practical guide to payload validation, sender domains, DNS, SMTP, and retries.
Aug 14, 202621 min read
How to Ensure Sensitive Data Isn’t Stored on Resend
Learn how to ensure sensitive data isn’t stored on Resend or any email provider with safer templates, logging controls, DNS, and retention practices.
Aug 13, 202620 min read
Email Affiliate Marketing in 2026: Why Quality Beats Volume
Email affiliate marketing still works, but advertisers now buy consent, relevance, and measurable lead quality—not raw list size.
Aug 13, 202618 min read
End-to-End Testing With Playwright: A Practical Guide
Learn end-to-end testing with Playwright for web apps and email flows, including reliable assertions, test data, SMTP checks, and CI strategy.
Aug 13, 202625 min read
Opportunistic TLS vs Enforced TLS: What’s the Difference in Email?
Learn how opportunistic TLS vs enforced TLS affects SMTP email delivery, downgrade resistance, DNS records, failures, and deliverability.
Aug 12, 202620 min read
What Email Addresses to Use for Testing Transactional Email
Learn which email addresses to use for testing transactional email, from local inboxes and real providers to deliverability tools and test domains.
Aug 12, 202621 min read
Apple Branded Mail Setup: DNS, DMARC, and Verification Guide
Set up Apple Branded Mail with the right DMARC policy, DNS verification, brand assets, testing workflow, and troubleshooting steps.
Aug 12, 202622 min read
2048-bit DKIM: Do You Need It for Email Delivery?
Do you need 2048-bit DKIM? Learn when 1024-bit is acceptable, how DNS limits affect setup, and how to verify DKIM for reliable delivery.
Aug 11, 202619 min read
Apple Mail Privacy Protection: How to Measure Email Engagement Without Open Rates
Apple Mail Privacy Protection makes open rates unreliable. Learn how to build smarter email engagement segments using clicks, conversions, and intent.
Aug 10, 202619 min read
Email Setup for New Domains: The Launch Task Founders Keep Underestimating
Email setup for new domains is a hidden launch tax. Learn how to standardize routing, sending, DNS authentication, and replies at scale.
Aug 10, 202620 min read
Volanea vs Mandrill: An Honest Comparison for Developers
Compare Volanea vs Mandrill on pricing, API and SMTP sending, deliverability controls, templates, analytics, support, and migration trade-offs.
Aug 8, 202622 min read
Volanea vs SparkPost: An Honest Comparison for Developers
Compare Volanea vs SparkPost on pricing, API and SMTP support, templates, analytics, deliverability tooling, and support for modern email teams.
Aug 7, 202622 min read
SMTP.com to Volanea Migration Guide for Developers
Migrate from SMTP.com to Volanea with a staged plan for code, DNS, webhooks, suppressions, templates, testing, and safe cutover.
Aug 7, 202625 min read
Migrate from Elastic Email to Volanea: Developer Guide
Migrate from Elastic Email to Volanea with a safe API cutover plan covering code, DNS, webhooks, suppressions, templates, testing, and rollback.
Aug 6, 202620 min read
How to Migrate from MailerSend to Volanea Without Disrupting Email
Migrate from MailerSend to Volanea with a practical plan for SMTP, DNS, webhooks, suppressions, templates, testing, and a safe cutover.
Aug 6, 202619 min read
Mailtrap to Volanea Migration Guide for Developers
Move production email from Mailtrap to Volanea with a safe SMTP cutover, DNS checks, webhook planning, suppression imports, and test steps.
Aug 6, 202623 min read
Mandrill to Volanea Migration Guide for Developers
Move transactional email from Mandrill to Volanea with a safe plan for code, DNS, webhooks, suppressions, templates, testing, and cutover.
Aug 6, 202620 min read
Migrate from Brevo to Volanea: A Developer’s Guide
Migrate from Brevo to Volanea with a practical developer checklist for sending code, DNS, webhooks, suppressions, templates, testing, and cutover.
Aug 6, 202621 min read
Amazon SES to Volanea Migration Guide for Email Developers
Amazon SES to Volanea migration guide for developers: move sending code, DNS, webhooks, templates, and suppressions with a staged, safe cutover.
Aug 5, 202622 min read
Transactional Email Resend: A Production Setup Guide
Set up transactional email with Resend, verify your domain, send reliable API emails, process webhooks, and troubleshoot delivery issues.
Aug 5, 202621 min read
SMTP Relay Meaning: How It Works, When You Need It, and How to Set It Up
Learn SMTP relay meaning, how relays route email, which ports and settings to use, and how to set up, secure, and test a relay.
Aug 5, 202621 min read
SMTP Relay Software: How to Choose, Configure, and Test It
Learn how to choose and configure SMTP relay software, secure authentication, set DNS records, troubleshoot delivery, and verify email sending.
Aug 4, 202622 min read
Email API Services: How to Choose, Configure, and Operate One
Compare email API services, configure domain authentication, send a real transactional email, process webhooks, and measure delivery correctly.
Aug 4, 202621 min read
Email API Send: A Practical Guide to Reliable Transactional Email
Email API send guide for developers: authenticate a domain, call a send endpoint, prevent duplicates, process events, and troubleshoot delivery.
Aug 3, 202622 min read
AI Email Subject Lines: Why Human Specificity Won a Real A/B Test
AI email subject lines can save time, but a 62,000-subscriber test shows why specific human context still wins—and how to test smarter.
Jul 29, 202620 min read
Email Segmentation Strategy: Why Sending Less Can Earn More
Build an email segmentation strategy that protects deliverability, lifts conversion, and turns engagement data into smarter campaign cadence and revenue.
Jul 28, 202620 min read
Transactional Email vs Marketing Email: The Practical Guide to Sending Both Correctly
Learn the transactional email vs marketing email difference, compliance rules, sending setup, examples, and how to protect deliverability.
Jul 26, 202621 min read
Email Authentication Protocols: A Practical SPF, DKIM, DMARC and ARC Guide
Learn how email authentication protocols work, configure SPF, DKIM, DMARC and ARC records, diagnose failures, and protect your domain from spoofing.
Jul 26, 202620 min read
The List vs. the Message Is the Wrong Email Marketing Debate
Audience-message match makes email marketing more effective: align subscriber expectations with relevant messaging, clear offers, and useful next steps.
Jul 24, 2026
Stripo Incident Is a Reminder That Your Email Stack Holds the Keys to Your Sender Reputation
The Stripo security incident shows why ESP API keys need rotation, least privilege, and monitoring. Follow steps to protect your sender reputation.
Jul 24, 2026
Gmail Promotions Isn’t a Graveyard—It’s a High-Intent Shelf
Gmail Promotions tab emails can drive action when they are relevant, trusted, and useful. Learn how to improve engagement beyond opens and placement.
Jul 24, 2026