Mailsac MCP. Automate Email Testing & Data Extraction
Mailsac manages disposable and private email addresses, letting your AI client automate testing workflows without needing real accounts. This MCP lets you reserve new, isolated inboxes, search through messages across multiple domains, and reliably extract sensitive data like verification codes or links from both plain text and HTML bodies.
Give Claude and any AI agent real-world access
Create new, isolated private addresses, list all reserved addresses, or delete old ones to keep your setup clean.
Fetch the full plain text body or the sanitized HTML structure of any specific message in an inbox.
List all messages received by a given address, allowing you to inspect what came through your temporary mailbox.
Query messages across every registered address using advanced search parameters like sender or subject line (requires paid tier).
Permanently remove a single message from an inbox, or completely clear out an entire mailbox when testing is finished.
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What AI agents can do with Mailsac: 9 Tools for Inbox & Domain Control
These tools let your agent list reserved addresses, search messages across all domains, and perform specific content extractions from emails.
Make your AI actually useful.
Add this MCP to Claude, Cursor, or Windsurf and your AI stops guessing. It gets real tools to look things up, take action, and handle the stuff you keep doing by hand.
Start using Mailsac MCPList Reserved Addresses
Retrieves a list of all the enhanced or custom email addresses you have reserved in your account.
Delete Inbox Message
Permanently removes a specific message from an inbox, ensuring clean test...
List Custom Domains
Shows all the custom domains that have been linked to and are active within your...
Get Html Message Body
Pulls out the complete, sanitized HTML code from a specific message for deep...
Get Plain Text Body
Extracts only the readable plain text content from a message body, perfect for...
List Inbox Messages
Fetches a list of all messages currently sitting in a specified inbox.
Release Reserved Address
Deletes and releases an email address that you no longer need, freeing up the reserved slot.
Reserve New Address
Programmatically secures a new, unique private email address for isolated testing...
Search Account Messages
Searches for messages across all your reserved addresses using advanced search...
Security and governance baked right in.
Pick your AI client below to get set up. Just create a Vinkius account, subscribe, and you're instantly up and running. We handle the entire backend infrastructure, delivering out-of-the-box support for HTTPS Streamable, SSE, and OAuth2—zero messy routing required.
Choose How to Get Started
Build a custom MCP for your own tools, or connect a ready-made integration from our catalog.
Build Your Own
Turn any API into an MCP. Import a spec, define Agent Skills, or deploy with MCPFusion.
- Import from OpenAPI, Swagger, or YAML specs
- Create Agent Skills with progressive disclosure
- Deploy to edge with MCPFusion framework
- Built in DLP, auth, and compliance on each call
- Real time usage dashboard and cost metering
- Publish to catalog or keep private
Make Your AI Do More
Start with Mailsac, then connect any of our 5,200+ other servers whenever your AI needs more. One click, no limits.
- Use this MCP plus 5,200+ others, all in one place
- Add new capabilities to your AI anytime you want
- Connections are secured and governed automatically
- Track usage and costs across all your servers
- Works with Claude, ChatGPT, Cursor, and more
- New servers added to the catalog weekly
Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by Mailsac. 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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~60% cost reduction
Manually tracking test emails slows down development.
Today, when your app sends a new email trigger—say, a welcome message or a failed payment alert—you have to manually open the inbox for that test address. Then you copy the content, paste it into a notepad, and sift through the HTML junk until you find the one piece of data, like an API key or verification code, you actually needed.
With this MCP, your agent handles all that noise. You tell your client to wait for the message; it retrieves the full body using `get_plain_text_body` and gives you nothing but the clean, actionable string. It saves you the copy-paste cycle every single time.
Mailsac MCP Gives You Full Control Over Inbox Data.
The biggest manual step that goes away is the guesswork. You no longer have to wonder if you're looking at plain text or a messy HTML version of the data, because your agent can decide which view—using `get_plain_text_body` or `get_html_message_body`—will give you what you need for that specific step.
It’s not just about reading emails; it's about treating them like a predictable resource. You control the entire lifecycle, from reserving the address to deleting the message with `delete_inbox_message`. That level of automation is a game-changer.
What Mailsac MCP does for your AI
Managing test emails used to be a nightmare of clicking tabs and manually copying codes. Now, your agent can handle the whole process directly. You connect this MCP via Vinkius and tell your AI client exactly what you need—whether it's checking if a new sign-up flow sends an email or grabbing a single verification code after a password reset.
Your agent reserves a clean, private address for the test run, waits for the message to land, and then pulls out only the data you asked for, whether that's raw plain text or structured HTML content. You can also inspect your entire setup by listing all reserved addresses and checking which custom domains are linked to your account.
Need cleanup? Your agent permanently deletes messages from an inbox or even clears out entire inboxes when testing is done. It’s pure automation for email-based operations.
019d75cd-1878-7253-bd65-c14fcb48f235 How to set up Mailsac MCP
The bottom line is that you tell your AI client what task needs doing with temporary emails, and this MCP executes the complex API calls on your behalf.
Subscribe to this MCP on Vinkius and enter your Mailsac API key.
Connect the credentials to your preferred AI client (like Cursor or Claude).
Instruct your agent using natural language commands, telling it exactly which action to perform—for example, 'Reserve a new address for testing' or 'Extract the code from the last email.'
Who uses Mailsac MCP
This MCP targets technical roles that spend time testing signup flows, password resets, or multi-step user journeys. It’s for developers who need reliable data extraction and QA engineers tired of manual inbox checking.
Automates the retrieval of verification codes from test emails, ensuring that every signup or workflow correctly sends a functional code.
Inspects incoming integration test emails and manages temporary addresses directly from their IDE without leaving their coding environment.
Tests account isolation by reserving unique private email addresses for each simulated user to ensure no cross-contamination of data occurs.
Benefits of connecting Mailsac MCP
Stop manually checking inboxes. Use the agent to reserve a clean address with reserve_new_address and then automatically wait for, read, and process incoming messages.
Extract data reliably. Instead of reading messy HTML, use get_plain_text_body to pull out only verification codes or tracking numbers into a simple text string.
Keep your environment clean. When testing is done, use delete_inbox_message or even clear the entire inbox to prevent test data from accumulating and causing clutter.
Track everything you own. You can always verify which addresses are active by running list_reserved_addresses, giving you full oversight of your email infrastructure.
Search complex histories easily. The search_account_messages tool lets you query messages across all domains using parameters like 'from' or 'to', saving hours of manual searching.
Mailsac MCP use cases
Testing a New Signup Flow
A QA engineer needs to test the password reset email. They ask their agent to reserve_new_address for 'test-user@mailsac.com'. The flow runs, sends the email, and the agent uses get_plain_text_body to pull out the unique reset code instantly, feeding it back into a testing script.
Debugging Email Triggers
A developer is debugging an integration that should send a confirmation email. They use their agent to list_inbox_messages for the test address, confirming the message arrived and then use get_html_message_body to check if all necessary tracking links are present in the source code.
Auditing Domain Usage
A DevOps engineer needs to know which custom domains are active for a new client project. They run list_custom_domains through their agent, getting an immediate list of all available and linked sender identities.
Investigating Failed Messages
A user suspects a message got lost in the shuffle. Instead of checking every single inbox, they ask their agent to use search_account_messages with date parameters, narrowing down potential messages across their entire account.
Mailsac MCP tradeoffs
What to watch out for, and the recommended way to handle each one.
Trying to scrape live email services
Using a general web scraping tool on an actual inbox. This is brittle, violates terms of service, and requires complex handling for logins and rate limits.
Always use this MCP. The agent first uses reserve_new_address to create isolated test environments, then reads the data safely using tools like get_plain_text_body.
Manually listing addresses
Opening a dashboard and clicking through multiple tabs to see all reserved domains. This is tedious and prone to human error.
Run the list_reserved_addresses tool with your agent. It immediately provides a comprehensive list of every active inbox you manage.
Assuming message content format
Treating all email data as raw text when it actually contains structured HTML elements like buttons and tables.
If structure matters, use get_html_message_body. If you only need the code or link, use get_plain_text_body for a cleaner, more predictable output.
When to use Mailsac MCP
Use this MCP if your job requires interacting with temporary, disposable, or private email addresses within a programmatic flow. Specifically, if you need to reserve an address, wait for a message, and then extract structured data like codes from that message (use get_plain_text_body for simple extraction). You must use it when testing automated workflows involving emails, such as signups or password resets.
Don't use this if you need to send mass marketing campaigns (that requires a dedicated bulk sender service) or if you just need a general email client interface. If your goal is simply to write an email from scratch and hit 'send,' then a standard messaging tool works better. But for testing, data extraction, and inbox maintenance, this MCP is the only thing you need.
Frequently asked questions about Mailsac MCP
How does the Mailsac MCP work for testing? +
The agent first uses reserve_new_address to create an isolated, clean inbox. When your application sends a test email, the agent detects it in that specific address and retrieves the content using tools like get_plain_text_body.
Can I search my entire Mailsac account history? +
Yes, you can use search_account_messages to query messages across all your addresses. This requires a paid tier but is essential for auditing old test data.
Is the content I get from Mailsac safe to use in my code? +
Yes, since this MCP runs through controlled API calls on Vinkius, the extracted data is passed directly as a clean string or object to your agent, making it ready for your application logic.
How do I delete an email message using Mailsac? +
You use the delete_inbox_message tool. You just need to specify which inbox and which message ID you want permanently removed, keeping your test data clean.
Can I check what domains are available for my account? +
Absolutely. The list_custom_domains tool lets you see all the custom email domains that have been linked to your Mailsac account, helping you plan new test setups.