Can I use templates with the send_transactional_email tool?

Yes, you can specify a `template_id` within the `email_json` body to use pre-defined designs created in your MailerSend account.

How do I filter activity for a specific event like 'opened'?

Use the `list_domain_activity` tool and provide the `params` string with the desired event types (e.g., `event[]=opened`).

Is there a limit to bulk email requests?

The `send_bulk_transactional_emails` tool supports up to 500 email objects per single request as per MailerSend API limits.

MailerSend MCP Server for Google ADK 10 tools — connect in under 2 minutes

Name: MailerSend
Availability: InStock
Author: Vinkius

google.github.io/adk-docs/tools/mcp-tools

Built by Vinkius GDPR 10 Tools SDK

Google Agent Development Kit (ADK) is Google's framework for building production AI agents. Add MailerSend as an MCP tool provider through Vinkius and your ADK agents can call every tool with full schema introspection.

Get MCP Server for AI Agents

ASK AI ABOUT THIS MCP SERVER

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Vinkius supports streamable HTTP and SSE.

python

from google.adk.agents import Agent
from google.adk.tools.mcp_tool import McpToolset
from google.adk.tools.mcp_tool.mcp_session_manager import (
    StreamableHTTPConnectionParams,
)

# Your Vinkius token. get it at cloud.vinkius.com
mcp_tools = McpToolset(
    connection_params=StreamableHTTPConnectionParams(
        url="https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp",
    )
)

agent = Agent(
    model="gemini-2.5-pro",
    name="mailersend_agent",
    instruction=(
        "You help users interact with MailerSend "
        "using 10 available tools."
    ),
    tools=[mcp_tools],
)

Fully ManagedVinkius Servers

60%Token savings

High SecurityEnterprise-grade

IAMAccess control

EU AI ActCompliant

DLPData protection

V8 IsolateSandboxed

Ed25519Audit chain

<40msKill switch

Stream every event to Splunk, Datadog, or your own webhook in real-time

* Every MCP server runs on Vinkius-managed infrastructure inside AWS - a purpose-built runtime with per-request V8 isolates, Ed25519 signed audit chains, and sub-40ms cold starts optimized for native MCP execution. See our infrastructure

About MailerSend MCP Server

Connect your MailerSend account to any AI agent to automate your transactional messaging and domain management. This MCP server enables your agent to send single or bulk emails, monitor domain verification, and track email activity directly from natural language interfaces.

Google ADK natively supports MailerSend as an MCP tool provider. declare Vinkius Edge URL and the framework handles discovery, validation, and execution automatically. Combine 10 tools with Gemini's long-context reasoning for complex multi-tool workflows, with production-ready session management and evaluation built in.

What you can do

Email Delivery — Send transactional emails instantly with support for HTML, text, and templates
Bulk Operations — Send up to 500 emails in a single batch request for high-volume communications
Domain Oversight — List sender domains, retrieve DNS settings, and trigger ownership verification checks
Recipient Management — List and query recipients from your account database to track engagement
Activity Auditing — Access real-time logs of email events (sent, delivered, opened, clicked) for any domain
Message Insight — Retrieve complete metadata and lifecycle history for individual sent messages

The MailerSend MCP Server exposes 10 tools through the Vinkius. Connect it to Google ADK in under two minutes — no API keys to rotate, no infrastructure to provision, no vendor lock-in. Your configuration, your data, your control.

How to Connect MailerSend to Google ADK via MCP

Follow these steps to integrate the MailerSend MCP Server with Google ADK.

Install Google ADK

Run pip install google-adk

Replace the token

Replace [YOUR_TOKEN_HERE] with your Vinkius token

Create the agent

Save the code above and integrate into your ADK workflow

Explore tools

The agent will discover 10 tools from MailerSend via MCP

Why Use Google ADK with the MailerSend MCP Server

Google ADK provides unique advantages when paired with MailerSend through the Model Context Protocol.

Google ADK natively supports MCP tool servers. declare a tool provider and the framework handles discovery, validation, and execution

Built on Gemini models, ADK provides long-context reasoning ideal for complex multi-tool workflows with MailerSend

Production-ready features like session management, evaluation, and deployment come built-in. not bolted on

Seamless integration with Google Cloud services means you can combine MailerSend tools with BigQuery, Vertex AI, and Cloud Functions

MailerSend + Google ADK Use Cases

Practical scenarios where Google ADK combined with the MailerSend MCP Server delivers measurable value.

Enterprise data agents: ADK agents query MailerSend and cross-reference results with internal databases for comprehensive analysis

Multi-modal workflows: combine MailerSend tool responses with Gemini's vision and language capabilities in a single agent

Automated compliance checks: schedule ADK agents to query MailerSend regularly and flag policy violations or configuration drift

Internal tool platforms: build self-service agent platforms where teams connect their own MCP servers including MailerSend

MailerSend MCP Tools for Google ADK (10)

These 10 tools become available when you connect MailerSend to Google ADK via MCP:

get_recipient_details

Get details for a specific recipient

get_sender_domain_details

Get details for a specific domain

get_sent_message_details

Get details for a specific sent message

list_domain_activity

List email activity for a specific domain

list_email_recipients

List all recipients in the account database

list_sender_domains

List all verified and unverified sender domains

list_sent_messages

List all sent email messages

send_bulk_transactional_emails

Send multiple transactional emails in one batch

send_transactional_email

Requires a JSON body with sender, recipient, and content (text/html) or template ID. Send a single transactional email

verify_sender_domain

Trigger a DNS verification check for a domain

Example Prompts for MailerSend in Google ADK

Ready-to-use prompts you can give your Google ADK agent to start working with MailerSend immediately.

"Send a transactional email to 'user@example.com' with subject 'Welcome' and body 'Hello!'."

"List all active sender domains in my account."

"Show recent opened events for domain ID '98765'."

Troubleshooting MailerSend MCP Server with Google ADK

Common issues when connecting MailerSend to Google ADK through the Vinkius, and how to resolve them.

McpToolset not found

Update: pip install --upgrade google-adk

MailerSend + Google ADK FAQ

Common questions about integrating MailerSend MCP Server with Google ADK.

How does Google ADK connect to MCP servers?

Import the MCP toolset class and pass the server URL. ADK discovers and registers all tools automatically, making them available to your agent's tool-use loop.

Can ADK agents use multiple MCP servers?

Yes. Declare multiple MCP tool providers in your agent configuration. ADK merges all tool schemas and the agent can call tools from any server in a single turn.

Which Gemini models work best with MCP tools?

Gemini 2.0 Flash and Pro models both support function calling required for MCP tools. Flash is recommended for latency-sensitive use cases, Pro for complex reasoning.