MailSnail
Mail physical letters and certified mail through USPS without a trip to the post office
Connects to the mailsnail.dev service to send USPS letters and certified mail. After signing in, Muse can turn a document or note into a mailed letter, so you can post notices, contracts or paperwork without visiting a post office.
Try asking Muse: "Send this signed contract to my client by certified mail."
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Source: Found in the official MCP Registry (io.github.iancollins27/mailsnail) · First listed November 7, 2026
Last 24 hours
Each bar is one check, every 15 minutes. Green means it answered. Last checked 24 min ago.
Is it safe to connect?
What Muse can see: You sign in to your own account with it, so Muse can reach what that account allows. Read what it asks for before you agree.
Before it acts: Read what Muse plans to do before you approve it, and remove the app from Muse when you stop using it.
musedirectory.ai is not part of Meta. More about how Muse handles your information
How to add it to Muse
MailSnail is not in Muse's Connectors list yet, and it needs you to sign in with your MailSnail account. Apps that need this kind of sign-in usually cannot be used from a Muse chat yet. Follow it here and we will tell you when it reaches Muse.
https://api.mailsnail.dev/mcpNot in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
Also use it in ChatGPT or Claude
MailSnail is a remote MCP server, so any assistant that can add a custom connector by link can use it. Same link, same tools.
Add it to ChatGPT
- 1
Open ChatGPT settings
In ChatGPT, open Settings, then Connectors (called Apps & Connectors on some accounts).
- 2
Turn on developer mode
Under Advanced settings, switch on Developer mode. That is what lets you add a connector by link.
- 3
Create the connector
Choose Create, give it a name, paste the link as the MCP server URL, and save. If it needs a sign-in, ChatGPT asks for it here.
- 4
Use it in a chat
Start a chat, open the tools menu, pick the connector, and ask. ChatGPT asks before it runs a tool the first time.
Custom connectors need a paid ChatGPT plan, and on Team, Enterprise and Edu accounts only an admin can add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in ChatGPT
Add it to Claude
- 1
Open Claude settings
In Claude, open Settings, then Connectors.
- 2
Add a custom connector
Choose Add custom connector, give it a name, and paste the link.
- 3
Connect and use it
If it needs a sign-in, Claude sends you to it. Then turn the connector on in a chat from the tools menu and ask.
Custom connectors are available on paid Claude plans; on Team and Enterprise accounts an admin may need to add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in Claude
https://api.mailsnail.dev/mcpWhat people ask Muse to do
Technical details: safety screening, tools, response time and recent checks
Response time at the last check: 217ms. Worked in n/a of checks over 30 days.
Screening · November 7, 2026
Screened, no issues found
Screening looks for known threats and hidden instructions at the time of the check, and runs again weekly and whenever the tool list changes. It cannot see the server's code, so only connect what you need and review what Muse asks to do. How screening works.
Tools
This endpoint requires sign-in before it lists tools, so there is no public tool catalog.
Link
https://api.mailsnail.dev/mcpQuestions about MailSnail in Muse
How do I connect MailSnail to Muse?
MailSnail is not in Muse's Connectors list yet, and it needs you to sign in with your MailSnail account. Apps that need this kind of sign-in usually cannot be used from a Muse chat yet. Follow it here and we will tell you when it reaches Muse.
Is MailSnail working right now?
At the last check (November 7, 2026, 04:26 UTC) the endpoint was working, sign-in needed, answering in 217ms. It is checked every 15 minutes.
Is MailSnail safe to connect to Muse?
It was screened on November 7, 2026 with the result "screened, no issues found". Screening checks the domain against threat feeds and reads the tools for hidden instructions and requests for passwords or card numbers. It cannot see the server's code, so grant only the access you need.
What can MailSnail do in Muse?
Mail physical letters and certified mail through USPS without a trip to the post office For example, you could ask Muse: "Send this signed contract to my client by certified mail."
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Is this yours?
This listing was added from public sources (Found in the official MCP Registry (io.github.iancollins27/mailsnail)). If you build MailSnail, claim it to correct the details and get your badge.
Paste this on your site or README. It always shows the latest check.
<a href="https://musedirectory.ai/connector/mailsnail"><img src="https://musedirectory.ai/badge/mailsnail.svg" alt="MailSnail on musedirectory.ai" width="236" height="40"></a>