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Developer resources

Featured Developer resources

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 · 3 min read

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

How-to guides

How-to guides 3 min read

How to clean a Mailchimp contact list (the right way)

Mailchimp will charge you for unengaged subscribers. Here is the right way to clean an audience without removing the people who actually open.

AD Admin

May 28, 2026

Email deliverability

Email deliverability 3 min read

Soft bounce vs hard bounce: the difference and how to handle each

Hard bounces stick around forever. Soft bounces are temporary. Here is the difference, what triggers each, and exactly how to handle them.

AD Admin

May 27, 2026

Tips & tactics

Tips & tactics 4 min read

Cold email deliverability: the checklist that gets you to inbox

Cold email is harder to deliver than newsletter or transactional. Here is the operator checklist that gets your messages to inbox in 2026.

AD Admin

May 26, 2026

How-to guides

How-to guides 3 min read

How to verify emails in Excel and Google Sheets

Got a column of emails in Excel or Google Sheets? Here are three ways to verify them, ranked from quickest to most thorough.

AD Admin

May 25, 2026

Email deliverability

Email deliverability 3 min read

Email bounce rate benchmarks by industry (2026 data)

A "good" bounce rate depends on the industry. Here are the 2026 benchmarks for SaaS, ecommerce, B2B, real estate, and more.

AD Admin

May 24, 2026

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