How to Use the MailerSend MCP in CrewAI

Q: How do I connect the MailerSend MCP Server to CrewAI?

Pass your Vinkius server URL directly into the mcps array when defining your CrewAI Agent. The agent automatically discovers tools like sendtransactionalemail and knows when to call them based on the task description.

Q: Can CrewAI agents check MailerSend delivery logs?

Yes, agents can use listdomainactivity and getsentmessagedetails to review delivery events. You can assign a specific analyst agent to read these logs and compile daily deliverability reports.

Q: How do I restrict CrewAI from sending unauthorized emails?

You can use the MCPServerHTTP class from crewai.mcp and apply a toolfilter. This lets you restrict the agent crew to read-only tools like listsenderdomains while blocking sending capabilities.

Q: How does CrewAI handle high-volume transactional sends?

Your agents can use sendbulktransactionalemails to offload batch processing to MailerSend. This avoids hitting rate limits that might occur if the agent tried to send hundreds of individual emails sequentially.

Deploy specialized agent crews to monitor domain health and coordinate bulk transactional emails with CrewAI and MCP.

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Connect MailerSend MCP to CrewAI

Create your Vinkius account to connect MailerSend to CrewAI and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup MailerSend with CrewAI

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Deploy a domain deliverability crew

Use `list_sender_domains` to set up a CrewAI team where one agent monitors domain health and another handles technical fixes. The monitoring agent checks domain status and flags any issues. If a domain drops off or fails verification, the technical agent can immediately trigger `verify_sender_domain` and check the detailed logs using `get_sender_domain_details` to report the exact DNS mismatch.

Run autonomous bulk email campaigns via MCP Server

Call `send_bulk_transactional_emails` to let your agent crew handle transactional campaigns autonomously. A coordinator agent compiles recipient lists via `list_email_recipients`, while a writer agent drafts the transactional content. Once the payload is ready, the execution agent sends the batch. This setup runs completely in the background without requiring manual developer intervention.

Automate bounce handling and list cleaning

Query `list_sent_messages` to keep your recipient list clean without manual database queries. A moderator agent can pull recent outbound activity and identify failing messages. The agent then calls `get_recipient_details` to find the bad addresses and flags them for removal. This proactive loop protects your domain reputation by weeding out invalid emails before your next run.

Setup guide

Set up MailerSend MCP in CrewAI

Prerequisites

Python 3.10+ installed
crewai package (pip install crewai)
Active Vinkius subscription with a valid endpoint token

1

Install CrewAI
Run pip install crewai to install the framework. MCP support is built-in via the mcps parameter.
2

Add the MCP URL to your agent
Pass your Vinkius endpoint directly to the mcps list. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. CrewAI handles tool discovery and caching automatically.
3

Kick off your crew
Create a Crew with your agent and tasks. Call crew.kickoff() — the agent will automatically invoke MailerSend tools as needed.

crew.py

from crewai import Agent, Task, Crew

agent = Agent(
    role="MailerSend Analyst",
    goal="Access and analyze MailerSend data via MCP.",
    backstory="Expert analyst with direct MailerSend access.",
    mcps=[
        "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    ],
)

task = Task(
    description="List recent MailerSend transactions",
    agent=agent,
    expected_output="A summary of recent activity",
)

crew = Crew(agents=[agent], tasks=[task])
result = crew.kickoff()
print(result)

Get your connection token →

Prerequisites

Python 3.10+ installed
crewai + crewai-tools packages
Active Vinkius subscription with a valid endpoint token

1

Install dependencies
Run pip install crewai crewai-tools. The MCPServerAdapter handles lifecycle management and tool conversion.
2

Connect with MCPServerAdapter
Use MCPServerAdapter as a context manager with SseServerParameters pointing to your Vinkius endpoint. The adapter automatically manages connection lifecycle.
3

Assign tools and run
Pass the returned mcp_tools to your agent's tools parameter. The adapter converts MCP tools to native BaseTool objects compatible with all CrewAI agents.

crew.py

from crewai import Agent, Task, Crew
from crewai_tools import MCPServerAdapter
from mcp import SseServerParameters

server_params = SseServerParameters(
    url="https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
)

with MCPServerAdapter(server_params) as mcp_tools:
    agent = Agent(
        role="MailerSend Analyst",
        goal="Access and analyze MailerSend data via MCP.",
        backstory="Expert analyst with direct MailerSend access.",
        tools=mcp_tools,
    )

    task = Task(
        description="List recent MailerSend transactions",
        agent=agent,
        expected_output="A summary of recent activity",
    )

    crew = Crew(agents=[agent], tasks=[task])
    result = crew.kickoff()
    print(result)

Get your connection token →

Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by MailerSend. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Common questions about MailerSend MCP in CrewAI

Pass your Vinkius server URL directly into the `mcps` array when defining your CrewAI Agent. The agent automatically discovers tools like `send_transactional_email` and knows when to call them based on the task description.

Yes, agents can use `list_domain_activity` and `get_sent_message_details` to review delivery events. You can assign a specific analyst agent to read these logs and compile daily deliverability reports.

You can use the `MCPServerHTTP` class from `crewai.mcp` and apply a `tool_filter`. This lets you restrict the agent crew to read-only tools like `list_sender_domains` while blocking sending capabilities.

Your agents can use `send_bulk_transactional_emails` to offload batch processing to MailerSend. This avoids hitting rate limits that might occur if the agent tried to send hundreds of individual emails sequentially.

The email addresses and message logs are processed on-the-fly inside Vinkius's secure, zero-trust V8 sandbox. No transactional data or recipient lists are stored permanently on Vinkius infrastructure.

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