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NeverBounce for AI agents

NeverBounce is an email verification service that checks address validity in bulk or in real time to reduce bounce rates. Connect it once through Arc0, and your agent, or Claude, ChatGPT and Cursor, can use it through one MCP endpoint, limited to what each user approved.

Connect NeverBounceSee the 12 actions ↓
EmailAPI keyMCP + RESTneverbounce.com
AUDIT LOG · NEVERBOUNCEPOLICY: acme-support
09:41:07 · claude · u_8f2read
neverbounce.search_jobs
Search bulk verification jobs✓ allowed · 212ms
09:41:08 · claude · u_8f2read
neverbounce.parse_job
Parse NeverBounce Job✓ allowed · 164ms
09:41:09 · claude · u_8f2write
neverbounce.jobs_start
Start NeverBounce Job✓ approved · approved by user
09:41:12 · claude · u_8f2destructive
neverbounce.jobs_delete
Delete NeverBounce Job✕ blocked · policy: deny
EVERY NEVERBOUNCE CALL, ON THE RECORD
01 · USE CASES

What agents do in NeverBounce.

01

Check a single email address

Verify one email address's deliverability before it goes into an outreach sequence.

02

Check a bulk job's results

Retrieve results from a completed bulk verification job to see which addresses are safe, a read-only lookup.

03

Approve before deleting a job

Require approval before deleting a verification job, since it removes its stored results.

02 · ACTIONS

12 NeverBounce actions, graded by risk.

Every NeverBounce action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.

read

2

Look things up. Allowed by default.

  • neverbounce.search_jobs
    Search bulk verification jobs
  • neverbounce.parse_job
    Parse NeverBounce Job

write

9

Create and change things. Allow, or ask the user first.

  • neverbounce.jobs_start
    Start NeverBounce Job
  • neverbounce.confirm_poe
    Confirm Proof of Email
  • neverbounce.jobs_create
    Create NeverBounce Bulk Verification Job
  • neverbounce.jobs_status
    Get bulk job status
  • neverbounce.account_info
    Get Account Info
  • neverbounce.jobs_results
    Retrieve Job Results
  • neverbounce.single_check
    NeverBounce Single Check
  • neverbounce.jobs_download_get
    Download Job Results (GET)
  • neverbounce.widget_send_event
    JS Widget Send Event

destructive

1

Delete, cancel or archive. Ask first, or deny outright.

  • neverbounce.jobs_delete
    Delete NeverBounce Job
03 · HOW IT WORKS

NeverBounce in three steps.

  1. 01Your users connect NeverBounceThey add their NeverBounce api key on Arc0 Connect, under your brand. It goes straight into the vault.
  2. 02You set the rulesReads run, writes like “start NeverBounce Job” can wait for the user, and “delete NeverBounce Job” can be denied outright.
  3. 03Any agent can actYour agent calls NeverBounce through the Arc0 SDK or MCP, and so can Claude, ChatGPT and Cursor. Every call lands on the audit log.
POLICY.TS
await arc0.policies.set('neverbounce', {
  read: 'allow',
  write: 'ask',        // jobs_start
  destructive: 'deny',  // jobs_delete
})

# Claude Code: the same connection, one URL
$ claude mcp add --transport http arc0 \
    https://mcp.arc0.ai/u/u_8f2
04 · AUTH AND DATA

How NeverBounce connects.

Users add their NeverBounce api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.

The same NeverBounce connection serves your agent over MCP and your own backend over REST and the proxy, so a user connects once. How Arc0 handles credentials →

AUTH
API key
CREDENTIALS
Per-tenant encrypted vault
MODEL SEES
Results only, never credentials
AUDIT LOG
Every call, on every plan
05 · WORKS WITH

Use NeverBounce from any agent.

Claude
ChatGPT
Cursor
Codex
VS Code
OpenAI Agents SDK
Claude Agent SDK
Vercel AI SDK
Mastra
LangGraph
06 · RELATED

More email apps.

Gmail62 actionsOutlook306 actionsSendGrid364 actionsMixmax94 actionsElastic Email91 actionsResend66 actionsLettr60 actionsPostmark46 actions
ALL EMAIL APPS →
07 · FAQ

NeverBounce and Arc0, answered.

Q01

Can I use NeverBounce with Claude, ChatGPT or Cursor?

Yes. Connect NeverBounce to Arc0 once, then add your Arc0 MCP URL to Claude, ChatGPT, Cursor, Claude Code or any other remote-MCP client. Each assistant only gets the NeverBounce actions you allow.

Q02

How do users connect NeverBounce?

Users add their NeverBounce api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.

Q03

Which NeverBounce actions can my agent take?

12 in total: 2 read, 9 write and 1 destructive, such as “start NeverBounce Job”. Your policies decide which of them each agent may call.

Q04

Can I stop my agent from deleting things in NeverBounce?

Yes. Actions like “delete NeverBounce Job” are graded destructive. Set destructive actions to deny, or to ask so the user approves each one, and blocked calls still show up on the audit log.

Q05

Can my own backend call NeverBounce too?

Yes. The same NeverBounce connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.

Get started

Plug NeverBounce into your agent.

Your users connect NeverBounce once, under your brand. Your agent gets 12 actions behind your policies, with every call on the record.

Connect NeverBounceBrowse all apps →

Free to build · MCP + REST · Audit log on every plan