Category · Developer resources

Developer resources

Practical guides on email verification, sender reputation, and keeping your lists clean. Written by the MailoClean team.

All posts Comparisons Developer resources Email deliverability How-to guides Tips & tactics

Developer resources

Developer resources 3 min read

Validate emails in Python, Flask, and Django

Python has good built-in tools for email validation, but none of them actually verify the mailbox. Here is the upgrade with Flask and Django examples.

AD Admin

Jun 1, 2026

Developer resources

Developer resources 3 min read

Validate emails in PHP and Laravel: from regex to real verification

PHP gives you filter_var, Laravel gives you validation rules. Neither tells you if the address is real. Here is the upgrade path.

AD Admin

May 31, 2026

Developer resources

Developer resources 3 min read

How to validate emails in a JavaScript signup form (properly)

Most signup forms use a regex check that catches typos but misses 90% of bad emails. Here is the real validation pattern with code.

AD Admin

May 30, 2026

Developer resources

Developer resources 4 min read

What is an MX record? Explained for non-engineers

MX records sit at the heart of email delivery, but most senders never look at one. Here is the plain-English explanation.

AD Admin

May 29, 2026

Developer resources

Developer resources 4 min read

SPF, DKIM, DMARC: the complete setup guide for 2026

Gmail and Yahoo now require all three. Here is the no-fluff setup guide for SPF, DKIM, and DMARC, with the common gotchas that break authentication.

AD Admin

May 23, 2026

Developer resources

Developer resources 5 min read

Email verification API: how to integrate one in your app (with code)

A practical guide to integrating an email verification API: authentication, request shape, response handling, retries, and signup-form patterns with copy-paste code.

AD Admin

May 5, 2026

Try the engine

Ready to clean a list?

Run a free verification on the homepage, or create an account to upload bulk CSVs.

Try free verifier Create account