How to Use the MailerCheck MCP in CrewAI

Q: Can I limit which MailerCheck tools a CrewAI agent can use?

Yes. When you set up the MCPServerHTTP connection, you can use a toolfilter. This lets you expose only specific tools, like verifysingleemail, to one agent, while giving another agent access to the batch tools.

Q: Can my agents check on the status of a batch job?

Yes. After one agent starts a job with createverificationbatch, any agent in the crew can use the getbatchresults tool with the batch ID to check its status and retrieve the results once it's complete.

Equip your CrewAI agents to handle email list hygiene autonomously. One agent validates, another reports.

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Create your Vinkius account to connect MailerCheck 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 MailerCheck with CrewAI

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Assign a 'Validator' Agent

With CrewAI, you can create an agent whose only job is to validate data. Give this agent access to the `verify_single_email` tool from this MCP server. When another agent in your crew—like a lead-processing agent—gets a new email, it delegates the validation task. The Validator agent runs the check and reports the result back. This keeps your agent roles clean and specialized.

Run an Autonomous Data Hygiene Crew

You can build a full, autonomous crew for keeping your email lists clean. One agent's job is to run `list_verification_batches` daily to find new imports. It passes the list to a 'Processor' agent, which uses `get_batch_results` to analyze the data. A 'Cleanup' agent then takes the list of invalid emails and removes them from your database. The whole process runs automatically, with each agent performing its specific function. That's the point of using an MCP server with a multi-agent framework.

Deploy a 'Quartermaster' Agent

Prevent your crew from failing due to resource limits. Create a dedicated 'Quartermaster' agent that periodically calls the `get_account_info` tool. If your MailerCheck credit balance drops below a set threshold, this agent's job is to alert a human operator or pause other agents in the crew that depend on this tool. It’s a simple way to make your autonomous system more reliable.

Setup guide

Set up MailerCheck 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 MailerCheck tools as needed.

crew.py

from crewai import Agent, Task, Crew

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

task = Task(
    description="List recent MailerCheck 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="MailerCheck Analyst",
        goal="Access and analyze MailerCheck data via MCP.",
        backstory="Expert analyst with direct MailerCheck access.",
        tools=mcp_tools,
    )

    task = Task(
        description="List recent MailerCheck 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 MailerCheck. 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 MailerCheck MCP in CrewAI

It's straightforward. You can pass the Vinkius MCP URL directly into the `mcps` parameter when defining your Agent in CrewAI. The agent will automatically discover and be able to use all the MailerCheck tools.

Yes. When you set up the `MCPServerHTTP` connection, you can use a `tool_filter`. This lets you expose only specific tools, like `verify_single_email`, to one agent, while giving another agent access to the batch tools.

A common pattern is to have a 'Researcher' agent that finds data, a 'Validator' agent that uses MailerCheck tools to clean it, and a 'Writer' or 'Executor' agent that acts on the clean data. This separates concerns and makes the crew more robust.

Yes. After one agent starts a job with `create_verification_batch`, any agent in the crew can use the `get_batch_results` tool with the batch ID to check its status and retrieve the results once it's complete.

The Vinkius platform processes each tool call in a completely isolated, single-use sandbox. The email addresses sent by your CrewAI agents are passed through this secure environment to MailerCheck and are never stored or logged on Vinkius servers.

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