Mailersend Integration for AI Agents

Securely connect your AI agents and chatbots (Claude, ChatGPT, Cursor, etc) with Mailersend MCP or direct API to send transactional emails, check delivery status, manage recipients, and fetch analytics through natural language.
BOOK A CALLGET STARTED FOR FREE
Mailersend Logo
Gradient Top
Gradient Middle
Gradient Bottom
divider

Supported Tools

Tools
Create Sending DomainTool to add a new sending domain to mailersend.
Create SMTP UserTool to create a new smtp user.
Create API TokenTool to create a new api token.
Create WebhookTool to create a new webhook for a mailersend domain.
Delete WebhookTool to delete an existing webhook.
Get API QuotaTool to retrieve current api usage quota.
Get DomainTool to fetch information for a specific sending domain.
List Domain RecipientsTool to list recipients for a domain.
Get sending domainsTool to retrieve a list of sending domains.
Get general API resourcesTool to retrieve general api resources and information.
List Sender IdentitiesTool to list sender identities.
Get sent messagesTool to retrieve a paginated list of sent messages.
Get email recipientsTool to retrieve a list of email recipients.
Get SMS ActivityTool to retrieve sms activity logs.
Get SMS InboundsTool to retrieve inbound sms messages.
List SMS MessagesTool to list sent sms messages with optional filters.
Get SMS NumbersTool to retrieve a paginated list of sms phone numbers.
Get SMS recipientsTool to retrieve a list of sms recipients.
Get SMTP usersTool to retrieve a list of smtp users.
Get email templatesTool to retrieve a list of email templates.
Get API TokensTool to retrieve a list of api tokens.
Get usersTool to retrieve a list of users associated with your account.
List webhooksTool to retrieve a list of webhooks.

Connect Mailersend MCP Tool with your Agent

Python
TypeScript

Install Composio

python
pip install composio claude-agent-sdk
Install the Composio SDK and Claude Agent SDK

Create Tool Router Session

python
from composio import Composio
from claude_agent_sdk import ClaudeSDKClient, ClaudeAgentOptions

composio = Composio(api_key='your-composio-api-key')
session = composio.create(user_id='your-user-id')
url = session.mcp.url
Initialize the Composio client and create a Tool Router session

Connect to AI Agent

python
import asyncio

options = ClaudeAgentOptions(
    permission_mode='bypassPermissions',
    mcp_servers={
        'tool_router': {
            'type': 'http',
            'url': url,
            'headers': {
                'x-api-key': 'your-composio-api-key'
            }
        }
    },
    system_prompt='You are a helpful assistant with access to Mailersend tools.',
    max_turns=10
)

async def main():
    async with ClaudeSDKClient(options=options) as client:
        await client.query('Send a transactional email to support@example.com with subject "Order Update"')
        async for message in client.receive_response():
            if hasattr(message, 'content'):
                for block in message.content:
                    if hasattr(block, 'text'):
                        print(block.text)

asyncio.run(main())
Use the MCP server with your AI agent

Connect Mailersend API Tool with your Agent

Python
TypeScript

Install Composio

python
pip install composio_openai
Install the Composio SDK

Initialize Composio and Create Tool Router Session

python
from openai import OpenAI
from composio import Composio
from composio_openai import OpenAIResponsesProvider

composio = Composio(provider=OpenAIResponsesProvider())
openai = OpenAI()
session = composio.create(user_id='your-user-id')
Import and initialize Composio client, then create a Tool Router session

Execute Mailersend Tools via Tool Router with Your Agent

python
tools = session.tools
response = openai.responses.create(
  model='gpt-4.1',
  tools=tools,
  input=[{
    'role': 'user',
    'content': 'Send a welcome email to a new user'
  }]
)
result = composio.provider.handle_tool_calls(
  response=response,
  user_id='your-user-id'
)
print(result)
Get tools from Tool Router session and execute Mailersend actions with your Agent

Why Use Composio?

AI Native Mailersend Integration

  • Supports both Mailersend MCP and direct API based integrations
  • Structured, LLM-friendly schemas for reliable tool execution
  • Rich coverage for sending, fetching, and querying Mailersend emails

Managed Auth

  • Built-in API key handling and secure storage
  • Central place to manage, scope, and rotate Mailersend access
  • Per user and per environment credentials instead of hard-coded keys

Agent Optimized Design

  • Tools are tuned using real error and success rates to improve reliability over time
  • Comprehensive execution logs so you always know what ran, when, and on whose behalf

Enterprise Grade Security

  • Fine-grained RBAC so you control which agents and users can access Mailersend
  • Scoped, least privilege access to Mailersend resources
  • Full audit trail of agent actions to support review and compliance

Use Mailersend with any AI Agent Framework

Choose a Framework you want to connect Mailersend with

Frequently Asked Questions

Do I need my own developer credentials to use Mailersend with Composio?

Yes, Mailersend requires you to configure your own API key. Once set up, Composio handles secure credential storage and API request handling for you.

Can I use multiple toolkits together?

Yes! Composio's Tool Router enables agents to use multiple toolkits. Learn more.

Is Composio secure?

Composio is SOC 2 and ISO 27001 compliant with all data encrypted in transit and at rest. Learn more.

What if the API changes?

Composio maintains and updates all toolkit integrations automatically, so your agents always work with the latest API versions.

Used by agents from

Context
ASU
Letta
glean
HubSpot
Agent.ai
Altera
DataStax
Entelligence
Rolai
Context
ASU
Letta
glean
HubSpot
Agent.ai
Altera
DataStax
Entelligence
Rolai
Context
ASU
Letta
glean
HubSpot
Agent.ai
Altera
DataStax
Entelligence
Rolai

Never worry about agent reliability

We handle tool reliability, observability, and security so you never have to second-guess an agent action.

Book a call↗Get started for free