Bigmailer for AI agents

BigMailer is a white-label email marketing platform for agencies managing multiple brands, used to run separate contact lists, campaigns, and templates under different brand identities. 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 Bigmailer See the 57 actions ↓

MarketingAPI keyMCP + RESTbigmailer.io

AUDIT LOG · BIGMAILERPOLICY: acme-support

09:41:07 · claude · u_8f2read

bigmailer.list_lists

List Contact Lists✓ allowed · 212ms

09:41:08 · claude · u_8f2read

bigmailer.get_list

Get List✓ allowed · 164ms

09:41:09 · claude · u_8f2write

bigmailer.create_list

Create List✓ approved · approved by user

09:41:12 · claude · u_8f2destructive

bigmailer.delete_list

Delete List✕ blocked · policy: deny

EVERY BIGMAILER CALL, ON THE RECORD

01 · USE CASES

What agents do in Bigmailer.

Add a contact to a brand's list

Create a contact under the right brand and list so it doesn't mix with another client's audience.

Launch a transactional campaign

Create a transactional campaign to send a one-off email tied to a specific customer action.

Delete a contact on request

Delete a contact only after the person asks to be removed, since suppressing them is usually safer than deleting.

02 · ACTIONS

57 Bigmailer actions, graded by risk.

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

read

Look things up. Allowed by default.

bigmailer.get_list
Get List
bigmailer.get_user
Get User
bigmailer.get_brand
Get Brand
bigmailer.get_field
Get Custom Field
bigmailer.list_lists
List Contact Lists
bigmailer.list_users
List Users
bigmailer.get_contact
Get Contact
bigmailer.get_segment
Get Segment
bigmailer.list_fields
List Fields
bigmailer.get_template
Get Template
bigmailer.list_senders
List Senders
bigmailer.get_user_info
Get User Information
bigmailer.list_contacts
List Contacts
bigmailer.list_segments
List Segments
bigmailer.list_templates
List Templates
bigmailer.list_all_brands
List All Brands

+ 11 MORE

write

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

bigmailer.create_list
Create List
bigmailer.create_user
Create User
bigmailer.update_list
Update List
bigmailer.update_user
Update User
bigmailer.create_brand
Create Brand
bigmailer.create_field
Create Field
bigmailer.update_brand
Update Brand
bigmailer.update_field
Update Field
bigmailer.create_contact
Create Contact
bigmailer.create_segment
Create Segment
bigmailer.update_contact
Update Contact
bigmailer.update_segment
Update Segment
bigmailer.create_template
Create Template
bigmailer.update_template
Update Template
bigmailer.create_bulk_campaign
Create Bulk Campaign
bigmailer.create_contact_batch
Create Contact Batch

+ 7 MORE

destructive

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

bigmailer.delete_list
Delete List
bigmailer.delete_user
Delete User
bigmailer.delete_field
Delete Custom Field
bigmailer.delete_contact
Delete Contact
bigmailer.delete_segment
Delete Segment
bigmailer.delete_template
Delete Template
bigmailer.delete_brand_property
Delete Brand Property

03 · HOW IT WORKS

Bigmailer in three steps.

01Your users connect BigmailerThey add their Bigmailer api key on Arc0 Connect, under your brand. It goes straight into the vault.
02You set the rulesReads run, writes like “create List” can wait for the user, and “delete List” can be denied outright.
03Any agent can actYour agent calls Bigmailer 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('bigmailer', {
  read: 'allow',
  write: 'ask',        // create_list
  destructive: 'deny',  // delete_list
})

# 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 Bigmailer connects.

Users add their Bigmailer 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 Bigmailer 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 Bigmailer from any agent.

Claude

ChatGPT

Cursor

Codex

VS Code

OpenAI Agents SDK

Claude Agent SDK

Vercel AI SDK

Mastra

LangGraph

06 · RELATED

More marketing apps.

Meta Ads67 actions

ActiveCampaign298 actions ActiveTrail159 actions

Adobe Marketing Agent12 actions

07 · FAQ

Bigmailer and Arc0, answered.

Q01

Can I use Bigmailer with Claude, ChatGPT or Cursor?

Yes. Connect Bigmailer 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 Bigmailer actions you allow.

Q02

How do users connect Bigmailer?

Users add their Bigmailer 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 Bigmailer actions can my agent take?

57 in total: 27 read, 23 write and 7 destructive, such as “create List”. Your policies decide which of them each agent may call.

Q04

Can I stop my agent from deleting things in Bigmailer?

Yes. Actions like “delete List” 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 Bigmailer too?

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

Get started

Plug Bigmailer into your agent.

Your users connect Bigmailer once, under your brand. Your agent gets 57 actions behind your policies, with every call on the record.

Connect Bigmailer Browse all apps →

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