Bulk Email Checker for AI agents
Bulk Email Checker verifies email addresses in bulk, flagging invalid, risky, or undeliverable ones before a campaign goes out to a mailing list. 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 Bulk Email Checker.
Verify one address before a send
Check whether a single email address on a list is deliverable before it gets a campaign send.
Screen a new signup
Verify a new signup's email address and mail server before adding the contact to a list.
Catch risky addresses pre-send
Flag a risky or disposable address on a list so it can be removed before a bulk send.
1 Bulk Email Checker actions, graded by risk.
Every Bulk Email Checker action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.
read
1Look things up. Allowed by default.
- bulk_email_checker.verify_emailVerify Email
write
0Create and change things. Allow, or ask the user first.
- No write actions.
destructive
0Delete, cancel or archive. Ask first, or deny outright.
- No destructive actions.
Bulk Email Checker in three steps.
- 01Your users connect Bulk Email CheckerThey add their Bulk Email Checker api key on Arc0 Connect, under your brand. It goes straight into the vault.
- 02You set the rulesReads run, and writes like “updates” can wait for the user to approve.
- 03Any agent can actYour agent calls Bulk Email Checker through the Arc0 SDK or MCP, and so can Claude, ChatGPT and Cursor. Every call lands on the audit log.
await arc0.policies.set('bulk_email_checker', { read: 'allow', write: 'ask', destructive: 'deny', }) # Claude Code: the same connection, one URL $ claude mcp add --transport http arc0 \ https://mcp.arc0.ai/u/u_8f2
How Bulk Email Checker connects.
Users add their Bulk Email Checker 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 Bulk Email Checker 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 Bulk Email Checker from any agent.
ClaudeChatGPTCursor
Codex
VS CodeOpenAI Agents SDKClaude Agent SDK
Vercel AI SDK
Mastra
LangGraph
Bulk Email Checker and Arc0, answered.
Can I use Bulk Email Checker with Claude, ChatGPT or Cursor?
Yes. Connect Bulk Email Checker 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 Bulk Email Checker actions you allow.
How do users connect Bulk Email Checker?
Users add their Bulk Email Checker 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 Bulk Email Checker actions can my agent take?
1 in total: 1 read, 0 write and 0 destructive. Your policies decide which of them each agent may call.
Can I make my agent read-only in Bulk Email Checker?
Yes. Allow read actions and deny writes in the Bulk Email Checker policy. Your agent can still look things up, and any write it attempts is blocked and logged.
Can my own backend call Bulk Email Checker too?
Yes. The same Bulk Email Checker connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.
Plug Bulk Email Checker into your agent.
Your users connect Bulk Email Checker 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