Blog
Discover the latest guides, tutorials, and announcements from our team.
Email testing 101
Explore different types of email testing, how to get started, and best practices to follow.
19min read
Subscribe to blog
Get the latest insights and updates delivered to your inbox.
Automate SPF, DKIM, DMARC and DNS checks with the testmail.app tools API
Check SPF, DKIM, DMARC, DNS, and email headers from your own code, with JavaScript, Python, and cURL examples and a GitHub Actions workflow that catches broken email authentication.
11min read
IMAP vs SMTP: What's the difference?
IMAP retrieves and syncs email, while SMTP sends it. Learn how IMAP and SMTP work, their common ports, key differences, and when to use each.
6min read
How to read email headers: A developer's guide
Learn how to read email headers, trace delivery, check SPF, DKIM and DMARC, inspect sender details, and test email headers automatically.
20min read
Subscribe to blog
Get the latest insights and updates delivered to your inbox.