Keep your Brevo contacts clean before the send, not after the bounce
Brevo automatically blocklists addresses that hard-bounce, so it stops mailing a known-bad address after the first failure - but it can't judge an address before that first failure. Those never-mailed invalids from imports, old signups, and typos each cost you a send credit and a reputation hit on their debut campaign. Qualisend closes that gap: connect Brevo to verify your contacts and save each result as a contact attribute, then blocklist the dead ones before you send. Here's how, plus the CSV, API, and no-code options.
Connect Brevo directly, no CSV needed
All you need is an API key
Paste your Brevo API key. Find it in Brevo under Settings → SMTP & API → API keys.
- Clean all contacts or a single list
- Results saved as attributes on each contact
- New contacts checked in real time via webhook
- Auto-clean every 7, 14 or 30 days
Prefer CSV or the API? Both work too, see below.
What Brevo cleans for you
Brevo's native hygiene centers on the blocklist. When an address hard-bounces, Brevo treats the error as permanent and blocklists it automatically - no retry - and the same blocklist aggregates unsubscriptions, spam complaints, and hard bounces in one place. Blocklisted contacts are skipped when you send a campaign, so you don't spend email credits on them, and Brevo deliberately keeps them in your account rather than deleting them so the record of their wish not to be contacted survives. For addresses Brevo has actually mailed, that's reliable automatic hygiene.
What it can't catch
The catch is timing: every one of those mechanisms is reactive - it needs a send and a failure to fire. An address is only blocklisted after it hard-bounces on a real campaign, which means you've already spent the credit and taken the reputation hit. Never-mailed invalids from imports and signup forms, disposable addresses, role addresses, and decayed mailboxes all look healthy until your first send touches them - exactly when a mailbox provider forms its first impression of your domain. An imported list is the sharpest case: it arrives with its bounce history stripped, so addresses that were already failing elsewhere look brand new, and Brevo will happily spend a credit delivering each one straight into a hard bounce.
Why a clean Brevo list matters
On Brevo the stake isn't a contact-count pricing tier - Brevo bills primarily on emails sent, not on how many contacts you store, so a blocklisted contact sitting in your account already costs you nothing. The real cost of a dead address is the wasted send credit and the reputation damage of its first failed delivery. Every never-mailed invalid you leave in a list is one credit spent delivering into a hard bounce - and that hard bounce is precisely the signal Gmail and Yahoo's 2024 sender rules, and Brevo's own bounce-rate limits, penalize you for. Verifying before the send means the credit is never spent and the reputation hit is never taken; the blocklist only ever helps after the address has already failed once.
Prefer CSV or the API? Here's the manual path
The native connector is the fastest route, but the CSV loop works on any Brevo plan: export from Brevo, verify in Qualisend, and act on the results.
Export your list from Brevo
Open Contacts, filter to the list you want to clean (or build a segment for a targeted maintenance clean), and export it to CSV.
Verify the file in Qualisend
Upload the CSV to Qualisend bulk cleaning - up to 1,000,000 addresses, duplicates charged once - or paste addresses directly. The free plan's 100 one-time credits cover a first sample.
Read the results
Every address returns deliverable, risky, undeliverable, or unknown with a reason code and sub-flags (catch-all, disposable, role, full mailbox), plus the MX provider and probe detail as evidence. Download the cleaned CSV.
Blocklist the undeliverables in Brevo
Filter your results to undeliverable, then add those addresses to Brevo's blocklist - the same place hard bounces land automatically, so they're skipped on every future send without being deleted. This does the reputation-saving work before the send instead of after.
Or automate it at signup
Prefer to keep junk out from the start? Verify at the point of capture with the Qualisend REST API (scoped keys, rate limits, webhooks), or wire a no-code flow through Zapier, Make, or n8n so new Brevo signups are checked before they're ever added - typos and disposable addresses never reach a send.
What Qualisend flags on every address
- Never-mailed invalid addresses that would hard-bounce on your next Brevo campaign
- Disposable / throwaway domains built to expire
- Role addresses (info@, support@) that skew engagement-judged automations
- Catch-all domains, flagged so you can move them to a dedicated list and throttle
- A 0-100 confidence score and machine-readable reason code for every address
The native Brevo connector is live. Connect it in Qualisend under Integrations and work with your Brevo list directly, no CSV needed.
What to do with each result
Every address comes back with a verdict and sub-flags. Here's the action that keeps your Brevo list clean without throwing away contacts you can still reach.
deliverableKeep sending as normal.deliverable + role flagKeep for transactional content; exclude from engagement-judged automations.risky + catch-all flagMove to a dedicated list and throttle your sends.risky + disposable flagBlocklist - the inbox was built to expire.unknownKeep and re-verify next clean - usually greylisting or rate-limiting, not a verdict on the mailbox.undeliverableBlocklist via the step above; don't wait for the bounce to prove it.Related reading
The full step-by-step: export, verify, and blocklist the dead addresses.
Cleaning is half of deliverability - authenticate your Brevo sending domain too.
Verify at signup so junk never enters your Brevo contacts.
Your per-campaign bounce rate is the tripwire that tells you when to re-clean.
Why a single hard bounce on debut costs more than a wasted credit.
The 2024 bounce and complaint thresholds Brevo senders are judged against.
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