Get started

Smtp2go for AI agents

SMTP2GO is a transactional email delivery service that businesses rely on to route outbound mail reliably and to track opens, bounces, and spam complaints. 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 Smtp2goSee the 32 actions ↓
EmailAPI keyMCP + RESTsmtp2go.com
AUDIT LOG · SMTP2GOPOLICY: acme-support
09:41:09 · claude · u_8f2write
smtp2go.domain_add
Add Sender Domain✓ approved · approved by user
09:41:12 · claude · u_8f2destructive
smtp2go.webhook_remove
Remove webhook✕ blocked · policy: deny
EVERY SMTP2GO CALL, ON THE RECORD
01 · USE CASES

What agents do in Smtp2go.

01

Check bounce stats before a send

Pull bounce and spam statistics for a sending domain before a large campaign goes out.

02

Search email activity for a recipient

Search email activity logs to confirm whether a specific message reached a recipient's inbox.

03

Confirm before adding a sender domain

Add a new sender domain only after confirming its DNS records, since sending mail depends on that setup.

02 · ACTIONS

32 Smtp2go actions, graded by risk.

Every Smtp2go action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.

read

0

Look things up. Allowed by default.

  • No read actions.

write

27

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

  • smtp2go.domain_add
    Add Sender Domain
  • smtp2go.webhook_add
    Add Webhook
  • smtp2go.email_search
    Search SMTP2GO Emails
  • smtp2go.webhook_edit
    Edit Webhook
  • smtp2go.webhook_view
    View Webhooks
  • smtp2go.template_edit
    Edit Email Template
  • smtp2go.template_view
    View Email Template
  • smtp2go.users_smtp_add
    Add SMTP User
  • smtp2go.activity_search
    Search Email Activity
  • smtp2go.suppression_add
    Add to Suppression List
  • smtp2go.template_search
    Search Email Templates
  • smtp2go.users_smtp_edit
    Edit SMTP User
  • smtp2go.users_smtp_view
    View SMTP Users
  • smtp2go.stats_email_spam
    Email Spam Statistics
  • smtp2go.suppression_view
    View Suppression List
  • smtp2go.ip_allow_list_add
    Add IP Allow List
+ 11 MORE

destructive

5

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

  • smtp2go.webhook_remove
    Remove webhook
  • smtp2go.users_smtp_remove
    Remove SMTP User
  • smtp2go.suppression_remove
    Remove suppression entry
  • smtp2go.ip_allow_list_remove
    Remove IP from Allow List
  • smtp2go.allowed_senders_remove
    Remove Allowed Sender
03 · HOW IT WORKS

Smtp2go in three steps.

  1. 01Your users connect Smtp2goThey add their Smtp2go api key on Arc0 Connect, under your brand. It goes straight into the vault.
  2. 02You set the rulesReads run, writes like “add Sender Domain” can wait for the user, and “remove webhook” can be denied outright.
  3. 03Any agent can actYour agent calls Smtp2go 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('smtp2go', {
  read: 'allow',
  write: 'ask',        // domain_add
  destructive: 'deny',  // webhook_remove
})

# 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 Smtp2go connects.

Users add their Smtp2go 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 Smtp2go 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 Smtp2go 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

Smtp2go and Arc0, answered.

Q01

Can I use Smtp2go with Claude, ChatGPT or Cursor?

Yes. Connect Smtp2go 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 Smtp2go actions you allow.

Q02

How do users connect Smtp2go?

Users add their Smtp2go 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 Smtp2go actions can my agent take?

32 in total: 0 read, 27 write and 5 destructive, such as “add Sender Domain”. Your policies decide which of them each agent may call.

Q04

Can I stop my agent from deleting things in Smtp2go?

Yes. Actions like “remove webhook” 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 Smtp2go too?

Yes. The same Smtp2go connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.

Get started

Plug Smtp2go into your agent.

Your users connect Smtp2go once, under your brand. Your agent gets 32 actions behind your policies, with every call on the record.

Connect Smtp2goBrowse all apps →

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