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Dynosend for AI agents

Dynosend is an email marketing platform for managing audiences and contacts, running campaigns, sending transactional messages, and tracking customer events. 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 DynosendSee the 18 actions ↓
EmailAPI keyMCP + RESTdynosend.com
AUDIT LOG · DYNOSENDPOLICY: acme-support
09:41:07 · claude · u_8f2read
dynosend.list_contacts
List Contacts✓ allowed · 212ms
09:41:08 · claude · u_8f2read
dynosend.get_contact
Get Contact✓ allowed · 164ms
09:41:09 · claude · u_8f2write
dynosend.create_contact
Create Contact✓ approved · approved by user
09:41:12 · claude · u_8f2destructive
dynosend.delete_contact
Delete Contact✕ blocked · policy: deny
EVERY DYNOSEND CALL, ON THE RECORD
01 · USE CASES

What agents do in Dynosend.

01

Send a transactional message

Send a transactional email to a contact right after an order or account event occurs.

02

Tag a contact after an event

Add tags to a contact once they trigger a tracked event, so future campaigns can target them.

03

Confirm before starting a campaign

Require approval before starting a campaign, since it sends to every contact in the audience at once.

02 · ACTIONS

18 Dynosend actions, graded by risk.

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

read

8

Look things up. Allowed by default.

  • dynosend.get_contact
    Get Contact
  • dynosend.get_audience
    Get Audience
  • dynosend.get_campaign
    Get Campaign
  • dynosend.list_contacts
    List Contacts
  • dynosend.list_audiences
    List Audiences
  • dynosend.list_campaigns
    List Campaigns
  • dynosend.find_duplicate_contacts
    Find Duplicate Contacts
  • dynosend.check_blacklist
    Check Blacklist

write

9

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

  • dynosend.create_contact
    Create Contact
  • dynosend.update_contact
    Update Contact
  • dynosend.add_tags_to_contact
    Add Tags To Contact
  • dynosend.add_email_to_blacklist
    Add Email To Blacklist
  • dynosend.send_transactional_message
    Send Transactional Message
  • dynosend.start_campaign
    Start Campaign
  • dynosend.record_contact_event
    Record Contact Event
  • dynosend.set_campaign_delivery_state
    Set Campaign Delivery State
  • dynosend.set_contact_subscription_status
    Set Contact Subscription Status

destructive

1

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

  • dynosend.delete_contact
    Delete Contact
03 · HOW IT WORKS

Dynosend in three steps.

  1. 01Your users connect DynosendThey add their Dynosend api key on Arc0 Connect, under your brand. It goes straight into the vault.
  2. 02You set the rulesReads run, writes like “create Contact” can wait for the user, and “delete Contact” can be denied outright.
  3. 03Any agent can actYour agent calls Dynosend 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('dynosend', {
  read: 'allow',
  write: 'ask',        // create_contact
  destructive: 'deny',  // delete_contact
})

# 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 Dynosend connects.

Users add their Dynosend 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 Dynosend 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 Dynosend 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

Dynosend and Arc0, answered.

Q01

Can I use Dynosend with Claude, ChatGPT or Cursor?

Yes. Connect Dynosend 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 Dynosend actions you allow.

Q02

How do users connect Dynosend?

Users add their Dynosend 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 Dynosend actions can my agent take?

18 in total: 8 read, 9 write and 1 destructive, such as “create Contact”. Your policies decide which of them each agent may call.

Q04

Can I stop my agent from deleting things in Dynosend?

Yes. Actions like “delete Contact” 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 Dynosend too?

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

Get started

Plug Dynosend into your agent.

Your users connect Dynosend once, under your brand. Your agent gets 18 actions behind your policies, with every call on the record.

Connect DynosendBrowse all apps →

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