Blog
Guides and research on email verification, bounce rates, catch-all domains, disposable addresses, list hygiene and sender reputation. Written by the people who run the engine.
@How to clean an ActiveCampaign list: verify contacts, tag them by verdict, and let automations unsubscribe dead contacts and re-confirm risky ones. Steps, a CSV alternative and a verdict table.
@A catch-all domain accepts mail for every address, real or not, so a verifier cannot confirm a mailbox. Here is how we detect it and how to mail those contacts safely.
@Greylisting is a mail server tactic that temporarily rejects unfamiliar senders with a 4xx code and accepts the retry. What it looks like in your reports, how long it lasts and what to do.
@A ten-step email list hygiene checklist: verify at capture, clean before big sends, drop role and disposable addresses, sunset the unengaged and keep your bounce rate under 2%.
@How to clean a Brevo contact list: connect with an API key, verify the list, write results to an attribute, move dead contacts to a suppression list or blocklist, and know when to re-run it.
@Email verification checks whether an address can really receive mail. We walk through syntax, MX, reputation lists, the SMTP handshake, catch-all probes and scoring.
@Cold lists are guessed, scraped and aged, so they bounce more. How to verify before every sequence, handle catch-all domains, stay under 1% bounces and keep the programme compliant.
@Double opt-in gives you proof of consent but loses 20% to 40% of signups; single opt-in grows faster but lets bad addresses in. How real-time verification changes the trade-off.
@Email lists typically lose 22% to 30% of their valid addresses every year. What drives decay, what it does to a 10,000-contact list, how to measure your own rate and how often to re-verify.
@A step-by-step guide to cleaning a HubSpot contact list: build the list, verify it through the integration, write the verdict to a custom property, then suppress and set undeliverable contacts to non-marketing.
@Spam traps are addresses that exist only to catch senders with bad lists. The three types, how they end up on your list, what verification can and cannot detect, and how to stay clear.
@A mistyped checkout email bounces the receipt and the password reset; fake accounts feed card testing. How to validate email at WooCommerce checkout without blocking real buyers.
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