Bouncer
Verify email addresses one at a time or in lists of up to 100,000 before you send.
Updated Oct 9, 2026
Overview
Bouncer verifies email addresses and says whether each one is safe to send
to. Every result has a status (deliverable, risky, undeliverable or unknown),
a reason such as rejected_email or low_deliverability, a 0–100 score, a
toxicity rating, and flags for catch-all domains, disposable and free
providers, role accounts and full mailboxes. It verifies in real time, in a
synchronous batch of up to 10,000 addresses, or in an asynchronous batch of
up to 100,000, and also checks domains and the toxicity of a list.
The hosted MCP server signs in with OAuth and uses the same credits as the app and the API. One credit verifies one address; Bouncer does not charge for duplicates within a list or for unknown results, and credits do not expire.
Workflows
Workflows that use Bouncer's tools.
Tools
What agents can reach at Bouncer.
Check a verification batch's statusReturns a batch's status (queued, processing or completed) and, with with-stats=true, how many addresses it has processed and its count of each verification status.
- Create a verification batch
Queues a list of up to 100,000 email addresses for verification and returns a batchId, the number of addresses and the duplicates found.
- Download a verification batch's results
Returns every address in a completed batch with its status, reason, score, toxicity and domain and account flags, optionally filtered to one status.
- Verify an email address
Checks one email address in real time and returns its status (deliverable, risky, undeliverable or unknown), the reason, a 0–100 score, toxicity and domain and account flags.
- Verify a list of email addresses
Verifies up to 10,000 email addresses in one request and returns a result for each, with status, reason, score, toxicity and domain and account flags.