go
Send Email with Go Using Volanea’s Transactional Email API
Send email with Go using Volanea’s transactional email API. Use REST for reliable delivery, templates, events, and serverless-friendly sending.
Aug 19, 202620 min read
Blog
Email deliverability, explained.
Practical guides to email deliverability, SPF, DKIM and DMARC, transactional email, bounces and sender reputation — from the team building Volanea.
Browse by topic
transactional email 497email deliverability 477email marketing 364email api 351webhooks 251deliverability 192email authentication 187transactional-email 187email-api 167smtp 160dmarc 123email infrastructure 106sender reputation 99email automation 78dkim 60spf 58email glossary 37email security 34newsletter growth 29email compliance 28email-deliverability 23email metrics 22email analytics 21cold email 17
organic social growth
Organic Social Growth: How to Turn Followers Into Newsletter Subscribers
Build an organic social growth system that earns attention, repurposes content, and turns followers into loyal newsletter subscribers.
Aug 19, 202620 min read
django
Django Email API for Transactional Email That Reaches Users
Django email API for transactional messages: use Volanea’s REST or SMTP delivery, authenticate domains, handle failures, and ship with confidence.
Aug 19, 202620 min read
laravel
Laravel Email API That Fits the Way You Build
Send reliable transactional email from Laravel with Volanea. Use familiar SMTP or REST, protect secrets, queue work, and improve delivery.
Aug 19, 202624 min read
email marketing
Email Capture Metrics: Why More Signups Can Mean Less Revenue
Email capture metrics should measure more than signups. Learn how to test popups, quizzes, revenue, retention, and incremental lift properly.
Aug 19, 202618 min read
rails
Rails Transactional Email API for Reliable Delivery
Send Rails transactional email through a REST API built for queues, retries, domain authentication, templates, and reliable delivery.
Aug 19, 202623 min read
ruby
Ruby Email API for Rails, Jobs, and Serverless Apps
Use a Ruby email API built for Rails, jobs, and serverless apps. Send through REST or SMTP, protect deliverability, and retry mail safely.
Aug 19, 202623 min read
php
Send Email from PHP with Volanea’s Transactional Email API
Send email from PHP with a dependable REST API built for Laravel, Symfony, and plain PHP—plus delivery, retries, secrets, and scaling guidance.
Aug 18, 202621 min read
python
Python Email API for Reliable Transactional Email
Use Volanea’s Python email API to send transactional email over REST, avoid SMTP friction, protect deliverability, and ship reliably.
Aug 18, 202622 min read
nodejs
Node.js Email API for Transactional and Campaign Email
Use Volanea’s Node.js email API and SMTP relay to send reliable transactional and campaign email across servers, serverless functions, and edge runtimes.
Aug 18, 202622 min read
wordpress
WordPress
Install the Volanea SMTP plugin to send WordPress email through the Volanea API. Setup, configuration, troubleshooting, and what's different from a normal SMTP plugin.
Aug 18, 20264 min read
nextjs
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
digitalocean
How to Add SPF, DKIM, and DMARC Records in DigitalOcean DNS
Learn how to add SPF, DKIM, DMARC, and return-path records in DigitalOcean DNS, avoid hostname errors, and verify email authentication.
Aug 18, 202619 min read
email authentication
How to Add SPF, DKIM, and DMARC Records in Squarespace
Learn how to add SPF, DKIM, DMARC, and return-path DNS records in Squarespace without broken hosts, duplicate SPF, or alignment issues.
Aug 18, 202621 min read
email authentication
Hetzner SPF DKIM DMARC Setup: Add Email DNS Records Correctly
Set up SPF, DKIM, DMARC, and return-path DNS records for a Hetzner domain. Avoid host-name errors, verify alignment, and protect delivery.
Aug 18, 202621 min read
dreamhost
DreamHost SPF, DKIM, and DMARC Setup for Email Domains
Set up DreamHost SPF, DKIM, DMARC, and return-path DNS records correctly to authenticate email, pass alignment, and avoid common DNS mistakes.
Aug 18, 202620 min read
ionos
IONOS SPF, DKIM, and DMARC Setup for Sending Domains
Set up IONOS SPF, DKIM, DMARC, and return-path DNS records correctly, avoid hostname mistakes, and verify your sending domain for email.
Aug 18, 202618 min read
dns
Gandi SPF, DKIM, and DMARC Setup for Sending Email
Set up SPF, DKIM, DMARC, and a custom return-path for a Gandi domain with exact DNS record shapes, dashboard steps, and fixes for common errors.
Aug 18, 202621 min read
dns
How to Add SPF, DKIM, DMARC, and Return-Path Records in Porkbun
Learn how to add SPF, DKIM, DMARC, and return-path DNS records in Porkbun, avoid host-field mistakes, and verify email authentication.
Aug 18, 202623 min read
email marketing
Gmail Blue Checkmark Expirations: Why BIMI Needs an Operations Plan
Gmail blue checkmark certificates are expiring at notable rates. Learn what lapsed BIMI means, how to measure ROI, and build a renewal plan.
Aug 18, 202619 min read
email authentication
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
namecheap
Namecheap SPF, DKIM, and DMARC Setup for Sending Domains
Set up Namecheap SPF, DKIM, DMARC, and return-path DNS records correctly, avoid host-field mistakes, and verify your email domain.
Aug 17, 202621 min read
godaddy
How to Add SPF, DKIM, DMARC, and Return-Path Records in GoDaddy
Add SPF DKIM DMARC records in GoDaddy with the right TXT and CNAME values, avoid hostname mistakes, and verify your email domain step by step.
Aug 17, 202621 min read
route-53
How to Add Route 53 Email Authentication Records for SPF, DKIM, and DMARC
Add Route 53 email authentication records correctly with this practical guide to SPF, DKIM, DMARC, return-path DNS, testing, and fixes.
Aug 17, 202619 min read
cloudflare
How to Add SPF, DKIM, and DMARC Records in Cloudflare
Learn how to add SPF, DKIM, DMARC, and return-path DNS records in Cloudflare, avoid host-name errors, and verify your sending domain.
Aug 17, 202620 min read
dns
How to Add DKIM and Return-Path Records to DigitalOcean DNS
Learn how to add DKIM and Return-Path records to DigitalOcean DNS, verify SPF alignment, prevent bounce issues, and test email authentication.
Aug 17, 202620 min read
email deliverability
Troubleshooting Email Delivery Issues: A Developer’s Guide
Troubleshooting email delivery issues? Diagnose API, SMTP, DNS, authentication, bounces, spam placement, and recipient-side failures systematically.
Aug 17, 202623 min read
inbound email
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
email deliverability
Open Tracking and Apple Mail: A Developer’s Guide to MPP
Learn how open tracking and Apple Mail Privacy Protection affect metrics, segmentation, automation, deliverability, and email analytics.
Aug 17, 202620 min read
email tracking
How Does Open Tracking Work? Pixels, Privacy, and Reliable Email Metrics
Learn how open tracking works, from invisible pixels and image requests to privacy proxies, custom domains, testing, and better email metrics.
Aug 17, 202622 min read
transactional-email
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
email deliverability
Sending Email From Domains With UTF-8 or Non-ASCII Characters
Learn how to send email from UTF-8 and non-ASCII domains using IDNA, Punycode, SPF, DKIM, DMARC, SMTPUTF8, and reliable testing.
Aug 17, 202618 min read
email deliverability
How to Send Email From Subdomains: DNS Setup and Deliverability
Learn how to send email from subdomains with SPF, DKIM, DMARC, return-path, and tracking DNS records, plus practical testing and troubleshooting.
Aug 17, 202623 min read
email deliverability
Subject Line and From Address Character Limits: A Developer Guide
Learn subject line and From address character limits, SMTP line rules, Unicode encoding, DNS constraints, and validation practices for reliable email delivery.
Aug 16, 202620 min read
cold email
Cold Email Outreach for Agencies: Why You’re Getting No Replies
Cold email outreach for agencies fails when the ask benefits only you. Learn how to earn replies with sharper research, offers, and deliverability.
Aug 16, 202619 min read
email design
Email Preheader Text: How to Add Preview Copy That Works
Learn how to add email preheader text with robust HTML, plain-text, testing, accessibility, and deliverability practices for transactional messages.
Aug 16, 202621 min read
email compliance
Managing Your Own Unsubscribe Process: A Developer Guide
Learn how to manage your own unsubscribe process with signed links, suppression data, one-click headers, testing, and compliance safeguards.
Aug 16, 202620 min read
email deliverability
How to Include a List-Unsubscribe Header (RFC 8058)
Learn how to add a List-Unsubscribe header and RFC 8058 one-click POST endpoint, test it, and avoid delivery and compliance mistakes.
Aug 16, 202618 min read
email deliverability
How to Add an Unsubscribe Link to Email (Code + Headers)
Learn how to add an unsubscribe link to email with a compliant footer, List-Unsubscribe headers, one-click POST endpoint, testing steps, and safeguards.
Aug 16, 202623 min read
saas security
SaaS Bot Protection: Why Email Verification Fails—and What to Build Instead
SaaS bot protection needs more than email verification. Build a layered defense with challenges, rate limits, telemetry, and risk-based controls.
Aug 16, 202622 min read
dmarc
Are Your Outlook Emails Going to Spam Because of DMARC?
Outlook emails going to spam can be a DMARC alignment problem. Learn how to inspect headers, fix SPF/DKIM, and publish a safe policy.
Aug 16, 202620 min read
dmarc
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
dmarc
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
email deliverability
Catch-All Email Verification: Don’t Delete Your Best Subscribers
Catch-all email verification is not a delete button. Protect sender reputation while retaining opted-in, engaged subscribers with a practical workflow.
Aug 16, 202619 min read
dmarc
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
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
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
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