Insights · deliverability · how-tos

MailoClean Blog

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

How-to guides

Featured How-to guides

Email verification for SaaS signup forms: complete playbook

Every SaaS signup form leaks fake accounts, trial abusers, and disposable signups. Here is the complete playbook to plug those holes.

AD Admin · Jun 12, 2026 · 3 min read

Comparisons

Comparisons 3 min read

Single opt-in vs double opt-in: which is actually better in 2026

Double opt-in trades list size for list quality. Single opt-in does the opposite. Here is the data on when each one wins.

AD Admin

Jun 11, 2026

Comparisons

Comparisons 3 min read

Mailchimp vs SendGrid: deliverability and when to use which

Mailchimp and SendGrid are often pitched as alternatives. They are not. Here is what each one actually does well.

AD Admin

Jun 10, 2026

Comparisons

Comparisons 3 min read

ZeroBounce vs NeverBounce: an honest comparison

ZeroBounce and NeverBounce both have loyal users. Here is where each one actually wins and where a third option might serve you better.

AD Admin

Jun 9, 2026

Tips & tactics

Tips & tactics 3 min read

Email frequency: how often is too often (data from real senders)

Sending too often kills engagement. Sending too rarely kills revenue. Here is the data on optimal email frequency by industry.

AD Admin

Jun 8, 2026

How-to guides

How-to guides 3 min read

How to warm up a new email sending domain in 2026

A fresh sending domain has zero reputation. Skip the warm-up and you start in spam. Here is the 4-week schedule that gets you to inbox.

AD Admin

Jun 7, 2026

Email deliverability

Email deliverability 4 min read

Spam traps: what they are and how to avoid them in 2026

Spam traps are addresses set up specifically to catch spammers. Hitting one can blocklist you for months. Here is how they work and how to avoid them.

AD Admin

Jun 6, 2026

Email deliverability

Email deliverability 3 min read

Email blocklists: how to check if you are on one (and how to get off)

Blocklists are the silent killers of email delivery. Here is which ones matter, how to check if you are on one, and the playbook for getting off.

AD Admin

Jun 5, 2026

Email deliverability

Email deliverability 3 min read

Catch-all domains explained (and how to send to them safely)

Catch-all domains accept every address at the SMTP layer, even non-existent ones. Here is what that means and how to send to them without bouncing.

AD Admin

Jun 4, 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