3LT Letter Mail
Rank #39,594com.3lgrouptechnology/3lt-letter-mail
Give AI assistants hands: send real USPS letters via MCP.
What you can do with 3LT Letter Mail
3LT Letter Mail is a Model Context Protocol (MCP) server published by 3LGroupTechnology. It ranks #39,594 of 150,963 active servers on MCP Toplist. 3LT Letter Mail is listed on Official MCP, with 1 tracked version. It was first listed on Oct 3, 2026 and most recently updated on Oct 3, 2026.
Not verifiedMCP Toplist has not yet written a checked profile for this server, so the paragraph above is assembled from registry data only. The repository README is the authority on what it does.
What 3LT Letter Mail can and cannot do
Not verifiedMCP Toplist has not catalogued this server's tools or limitations. The repository README lists them.
What you need before using 3LT Letter Mail
The registry listing declares no required environment variables or authentication. This is declared metadata, not a verified install — the repository README is the authority.
MCP Toplist probed the public endpoint on Oct 16, 2026 and could not complete the MCP handshake (jsonrpc error). Requirements remain unverified.
Declared by the Official MCP Registry, last synced Oct 22, 2026. Not independently verified by MCP Toplist.
Hosted endpoint declared as public.
Connect 3LT Letter Mail and confirm it works
claude mcp add --transport http 3lt-letter-mail https://3lgrouptechnology.com/mcp[mcp_servers.3lt-letter-mail]
url = "https://3lgrouptechnology.com/mcp"Add to ~/.codex/config.toml.
https://3lgrouptechnology.com/mcpSettings → Connectors → “Add custom connector”, then paste this URL.
{
"mcpServers": {
"3lt-letter-mail": {
"url": "https://3lgrouptechnology.com/mcp"
}
}
}Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (per project).
{
"servers": {
"3lt-letter-mail": {
"type": "http",
"url": "https://3lgrouptechnology.com/mcp"
}
}
}Save as .vscode/mcp.json in your workspace.
{
"mcpServers": {
"3lt-letter-mail": {
"serverUrl": "https://3lgrouptechnology.com/mcp"
}
}
}Add to ~/.codeium/windsurf/mcp_config.json.
{
"mcpServers": {
"3lt-letter-mail": {
"url": "https://3lgrouptechnology.com/mcp"
}
}
}After adding the config, ask your client to list this server's tools. A tool list confirms the connection; an empty list or an error means the server did not start or needs credentials.
What changed, and when this was checked
- First listed
- Oct 3, 2026
- Latest version published
- Oct 3, 2026
- Version history
- 1 version tracked (below)
- Requirements evidence
- MCP Toplist probed the public endpoint on Oct 16, 2026 and could not complete the MCP handshake (jsonrpc error). Requirements remain unverified.
- Profile checked
- Not yet — purpose, capabilities and requirements above come from registry data only
- Ranking data as of
- Oct 3, 2026
- Official MCP ↗listed since Oct 4, 2026 · still listed
Do you maintain 3LT Letter Mail? to correct or enrich this profile.
Available versions (1)
| Version | Published |
|---|---|
| 1.0.0 | Oct 3, 2026 |
Ranks ahead of 111,369 of 150,963 servers on MCP Toplist.
Show your rank
Maintain this server? Add the live rank badge to your README — it updates automatically as the leaderboard changes.
[](https://mcptoplist.com/server/com.3lgrouptechnology%2F3lt-letter-mail)<a href="https://mcptoplist.com/server/com.3lgrouptechnology%2F3lt-letter-mail"><img src="https://mcptoplist.com/badge/com.3lgrouptechnology%2F3lt-letter-mail.svg" alt="MCP Toplist: Top 50% of 150,963" /></a>Variants: append ?metric=score or ?metric=stars to the image URL.
Frequently asked questions
- Who maintains 3LT Letter Mail?
- 3LT Letter Mail is maintained by 3LGroupTechnology, which publishes 1 MCP server (1 total version) tracked on MCP Toplist.
- Is 3LT Letter Mail listed on the Official MCP Registry?
- Yes — 3LT Letter Mail is listed on the Official MCP Registry.
- How many versions does 3LT Letter Mail have?
- MCP Toplist tracks 1 version of 3LT Letter Mail, most recently published on Oct 3, 2026.
- Where can I find the source code for 3LT Letter Mail?
- The source code for 3LT Letter Mail is hosted at github.com/3LGroupTechnology/3lt-letter-mail.
Do you run this server?
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