Email verification for Brevo (Sendinblue)

To verify Brevo emails, export your contact list as a CSV, run it through an email verification tool before import, and remove Invalid and Risky addresses. Clean lists keep your bounce rate under 2%, protect your sender reputation, and stop Brevo from throttling or suspending your sending. Verify before every major campaign.

Why clean your Brevo contacts before every campaign?

Brevo scores every send on bounce rate, spam complaints, and engagement. Dirty lists with invalid addresses trigger hard bounces fast. Too many hard bounces and Brevo throttles your throughput or pauses the account for review. Verifying first removes the addresses that would bounce, protecting your deliverability and daily sending limits.

Brevo shares IP pools across many senders on its lower-tier plans. Your bounce behavior affects the neighbors on that shared IP, so the platform watches new and reactivated lists closely. Import a stale list of 5,000 contacts you scraped a year ago, and a real chunk of those mailboxes are already dead. Every dead address becomes a hard bounce the moment you hit send, and Brevo counts each one against you. The fix is not clever copy or better send times. It is a clean list going in.

What happens when your Brevo bounce rate climbs?

A rising bounce rate tells mailbox providers your list is poorly maintained. Gmail, Outlook, and Yahoo start routing your mail to spam or rejecting it outright. Brevo may cap your sending volume, require a list review, or suspend the account. Keeping hard bounces under 2% avoids all three outcomes.

Blocklists are the other risk. Operators like Spamhaus watch for sudden spikes in bounces and hits on spam traps. Land on a major blocklist and delivery drops across every mailbox provider, not just the one that flagged you. Getting delisted takes days and a documented cleanup, and your campaign calendar stalls while you wait. Warm up new domains slowly, and never blast a freshly imported cold list at full volume. Brevo notices the pattern, and so do the inbox providers.

How do you verify Brevo emails before import?

Export your contacts from Brevo as a CSV, run the file through an email verification tool, then re-import only the Deliverable addresses. Keep Risky contacts in a separate segment for a warm-up send. Delete Invalid ones. The whole loop takes minutes and runs before you build the campaign.

1. In Brevo, open Contacts, select your list, and export it as a CSV.
2. Open the Free Email Verifier and drop the CSV in. The file is parsed in your browser and never uploaded.
3. Let the local safety scan flag bad syntax, duplicates, and disposable domains instantly, without touching your daily quota.
4. Run MX-record and SMTP-level checks on the remaining addresses to confirm each mailbox actually exists.
5. Export the results, keep the Deliverable rows, and move the Risky ones into their own segment.
6. Import the clean file back into Brevo and build your campaign against the verified segment.

What the verdicts mean for your Brevo list

A good verifier does not just split addresses into good and bad. Each one gets a verdict you can act on inside Brevo. Map those verdicts straight to segments so you never guess which contacts are safe to mail and which need a slower approach. Do this once and every future campaign inherits a clean baseline.

Should you delete or segment Risky Brevo contacts?

Delete Invalid addresses, but do not delete Risky ones outright. Risky means catch-all, role, or disposable, not confirmed dead. Move them into a separate Brevo segment and send a low-volume warm-up first. If they engage, promote them to your main list. If they bounce, remove them then.

Role addresses like info@ or sales@ often route to shared inboxes with low engagement and higher complaint rates. Catch-all domains accept everything at the server, so a Deliverable-looking result may still bounce. Treating both as Risky protects your sender score while giving genuine contacts a path back into your active audience. The scan also flags likely typos, so an address on gmial.com gets a suggested correction before you delete a real contact by mistake. That single step recovers contacts you would otherwise lose.

How often should you clean your Brevo list?

Verify before every major campaign, and run a full list clean every 90 days. Email lists decay by roughly 2 to 3% each month as people change jobs and abandon inboxes. Re-engagement sends to old segments need a fresh check first. New signups can be verified at the point of capture.

Frequency depends on how fast your list grows and where contacts come from. A B2B list built from events and webinars ages quickly because people change companies. A newsletter list of engaged consumers decays slower. Either way, a stale contact costs nothing to remove and everything if it bounces during a large send. Put a recurring calendar reminder on the first of each quarter.

Verify at the point of signup, not just before sends

The cleanest Brevo lists get checked at capture. Add a verification step to your signup form or the automation that feeds Brevo, and bad addresses never enter your database. That means fewer typos from mistyped domains, fewer disposable signups from throwaway campaigns, and a lower bounce rate from day one. Pre-send cleaning still matters, but catching problems at the door does most of the work. Brevo automations and forms both support a verification hook, so the setup is a one-time job.

Brevo gives you the sending infrastructure. Keeping the list clean is your job. Verify before every campaign, segment by verdict, and clean the whole list each quarter. Do that and your bounce rate stays low, your emails land in the inbox, and Brevo keeps your account in good standing. Treat verification as basic list hygiene, the same as backing up a database. Cheap to do, expensive to skip. The free tool makes the pre-send check a two-minute habit.