Emailvalidation for AI agents
Emailvalidation.io validates email addresses for deliverability and quality, and reports on account quota usage, used by teams that want to check addresses before they hit 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 Emailvalidation.
Validate an email address
Validate an address before it is added to a mailing list to avoid a bounce.
Check remaining quota
Get the account's quota status before running a large batch of validations.
Read-only validation checks
Keep every validation call read-only, since the API only checks addresses and never sends mail.
2 Emailvalidation actions, graded by risk.
Every Emailvalidation action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.
read
2Look things up. Allowed by default.
- emailvalidation.get_account_quota_statusGet Account Quota Status
- emailvalidation.validate_email_addressValidate Email Address
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.
Emailvalidation in three steps.
- 01Your users connect EmailvalidationThey add their Emailvalidation 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 Emailvalidation through the Arc0 SDK or MCP, and so can Claude, ChatGPT and Cursor. Every call lands on the audit log.
await arc0.policies.set('emailvalidation', { 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 Emailvalidation connects.
Users add their Emailvalidation 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 Emailvalidation 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 Emailvalidation from any agent.
ClaudeChatGPTCursor
Codex
VS CodeOpenAI Agents SDKClaude Agent SDK
Vercel AI SDK
Mastra
LangGraph
Emailvalidation and Arc0, answered.
Can I use Emailvalidation with Claude, ChatGPT or Cursor?
Yes. Connect Emailvalidation 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 Emailvalidation actions you allow.
How do users connect Emailvalidation?
Users add their Emailvalidation 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 Emailvalidation actions can my agent take?
2 in total: 2 read, 0 write and 0 destructive. Your policies decide which of them each agent may call.
Can I make my agent read-only in Emailvalidation?
Yes. Allow read actions and deny writes in the Emailvalidation policy. Your agent can still look things up, and any write it attempts is blocked and logged.
Can my own backend call Emailvalidation too?
Yes. The same Emailvalidation connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.
Plug Emailvalidation into your agent.
Your users connect Emailvalidation once, under your brand. Your agent gets 2 actions behind your policies, with every call on the record.
Free to build · MCP + REST · Audit log on every plan