Email List Cleaning — Improve Deliverability Before You Send
A clean list is the single biggest factor in email deliverability. Remove invalid addresses before they bounce, and protect the domain reputation you've spent years building.
What Mailbeam checks
Every verification runs 7 checks in parallel and returns a structured result in under 100ms.
Batch processing up to 100k
Submit your entire list via API. Processing is asynchronous — no connection timeouts or dropped jobs.
Three-way segmentation
Every address is classified as Deliverable, Risky, or Undeliverable. Make a different decision for each segment.
Bounce rate protection
Removing undeliverable addresses before sending keeps your bounce rate below the 2% ISP threshold that triggers reputation damage.
Sender reputation safe
Disposable and role-based emails have near-zero engagement and high spam complaint rates. Removing them before sending improves your reputation score.
Compatible with any ESP
Export clean results and import into Mailchimp, SendGrid, Klaviyo, Lemlist, Apollo, or any other sending platform.
Scheduled re-verification
Set up regular re-verification jobs via the API to keep your list fresh as email addresses change.
How it works
Export your current list
Pull your contact list from your CRM, ESP, or database as a JSON array or CSV.
Submit to the batch API
POST the email array to Mailbeam's batch endpoint. Include a webhook URL to be notified when complete.
Review segmented results
Results arrive classified as Deliverable, Risky, or Undeliverable — each with a score and individual check breakdown.
Import the clean segment
Import the Deliverable segment back into your ESP. Suppress the Undeliverable segment. Decide on Risky based on your tolerance.
When to use it
Before every major campaign
Run a cleaning pass before any campaign to a list older than 90 days. Even a quarterly send can have 10%+ decay.
After importing contacts
Any contact imported from trade shows, events, bought lists, or third-party sources should be verified before entering your system.
When bounce rate exceeds 1.5%
If your bounce rate is climbing, a cleaning pass can often identify the problem segment and bring it back under control.
Quarterly maintenance
Business email churn runs at 30% per year. A quarterly cleaning pass keeps your database accurate and deliverable.
Frequently asked questions
Ready to integrate?
Free tier includes 1,000 verifications/month. No credit card required.