Invalid Bounce for AI agents
Invalid Bounce verifies email addresses in bulk to reduce bounce rates before a sending campaign. Teams use it to keep this process accurate at a scale manual review cannot match. 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.
What agents do in Invalid Bounce.
Verify a list before sending
Run a mailing list through bulk verification to remove addresses likely to bounce.
Check verification job status
Check whether a submitted bulk verification job has completed before pulling results.
Review flagged addresses
Review the addresses flagged as risky, read-only, before deciding whether to remove them.
1 Invalid Bounce actions, graded by risk.
Every Invalid Bounce action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.
read
0Look things up. Allowed by default.
- No read actions.
write
1Create and change things. Allow, or ask the user first.
- invalid_bounce.start_bulk_verificationStart Bulk Email Verification
destructive
0Delete, cancel or archive. Ask first, or deny outright.
- No destructive actions.
Invalid Bounce in three steps.
- 01Your users connect Invalid BounceThey add their Invalid Bounce api key on Arc0 Connect, under your brand. It goes straight into the vault.
- 02You set the rulesReads run, and writes like “start Bulk Email Verification” can wait for the user to approve.
- 03Any agent can actYour agent calls Invalid Bounce through the Arc0 SDK or MCP, and so can Claude, ChatGPT and Cursor. Every call lands on the audit log.
await arc0.policies.set('invalid_bounce', { read: 'allow', write: 'ask', // start_bulk_verification destructive: 'deny', }) # Claude Code: the same connection, one URL $ claude mcp add --transport http arc0 \ https://mcp.arc0.ai/u/u_8f2
How Invalid Bounce connects.
Users add their Invalid Bounce 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 Invalid Bounce 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
Use Invalid Bounce from any agent.
ClaudeChatGPTCursor
Codex
VS CodeOpenAI Agents SDKClaude Agent SDK
Vercel AI SDK
Mastra
LangGraph
Invalid Bounce and Arc0, answered.
Can I use Invalid Bounce with Claude, ChatGPT or Cursor?
Yes. Connect Invalid Bounce 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 Invalid Bounce actions you allow.
How do users connect Invalid Bounce?
Users add their Invalid Bounce 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.
Which Invalid Bounce actions can my agent take?
1 in total: 0 read, 1 write and 0 destructive, such as “start Bulk Email Verification”. Your policies decide which of them each agent may call.
Can I make my agent read-only in Invalid Bounce?
Yes. Allow read actions and deny writes in the Invalid Bounce policy. Your agent can still look things up, and any write it attempts is blocked and logged.
Can my own backend call Invalid Bounce too?
Yes. The same Invalid Bounce connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.
Plug Invalid Bounce into your agent.
Your users connect Invalid Bounce once, under your brand. Your agent gets 1 actions behind your policies, with every call on the record.
Free to build · MCP + REST · Audit log on every plan