Sendsets vs io.github.therealMrFunGuy/test-mailbox
Sendsets is an MCP server published by AddisonHoff. Marketplaces we read that list it: 2 (Official MCP Registry, Community GitHub marketplaces). io.github.therealMrFunGuy/test-mailbox is an MCP server published by therealMrFunGuy. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-10-15. This pair was picked by a reader, not by our comparison rule, so search engines are asked not to index the page.
Where each is published
| Marketplace |  Sendsets |  io.github.therealMrFunGuy/test-mailbox |
|---|---|---|
| Official MCP Registry | Listed Version: 1.0.0 Forks (GitHub): 0 Stars (GitHub): 2 Not marked · First seen |
Listed Version: 1.0.0 No figure published Not marked · First seen |
Each figure is the marketplace's own and is never added up across marketplaces. A marketplace that publishes no figure shows none: no number is not zero.
The facts side by side
| Fact | Sendsets | io.github.therealMrFunGuy/test-mailbox |
|---|---|---|
| Marketplaces that list it (differs) | 2 (better) | 1 (worse) |
| Stars (GitHub) (differs) | 2 | No figure on GitHub |
| Forks (GitHub) (differs) | 0 | No figure on GitHub |
| Last release | Not published | Not published |
| Where it runs (differs) | Remote server (api.sendsetsapi.com/v1/mcp) | Remote server (mail.rjctdlabs.xyz/sse) |
| Transport (differs) | Streamable HTTP | SSE |
| Tools it declares | Not published | Not published |
| Environment variables it asks for | Not published | Not published |
| Parts of the bundle (differs) | 4 | Not a bundle |
| Licence (differs) | Apache-2.0 | Not stated |
| Repository (differs) | github.com/addisonhoff/sendsets | Not stated |
| Changes in the last 7 days (differs) | 2 | 0 |
| First seen | 2026-10-11 | 2026-10-11 |
| Endpoint at the last check (differs) | not checked yet | Not responding since 2026-10-13 |
Lines where the two differ have a tinted background and bold values. Where the data itself says which value is better (more marketplaces, a larger figure of the same marketplace, a fresher release, a verified mark on a marketplace that lists both), the better one is also marked green with ▲ and the worse one red with ▼. Where it runs, the transport, the tools, the settings, hooks, the bundle's parts, the licence and the week's changes are marked only as different: more or fewer is not better in itself.
What each says it does
Sendsets
Cold email API for AI agents: connect mailboxes, warm up, run campaigns and handle replies.
io.github.therealMrFunGuy/test-mailbox
Disposable email inboxes for testing — create addresses, wait for messages, extract links.
How to run each
Sendsets As a remote MCP server
claude mcp add --transport http sendsets https://api.sendsetsapi.com/v1/mcpio.github.therealMrFunGuy/test-mailbox As a remote MCP server
claude mcp add --transport sse test-mailbox https://mail.rjctdlabs.xyz/sseCommands built only from what the marketplaces declare; the full set for every client is on each card.
Only io.github.therealMrFunGuy/test-mailbox has a remote endpoint we check. How we check endpoints
Tools each declares
Neither one's marketplaces publish a list of tools, so there is nothing to compare.
Settings each asks for
Neither one's marketplaces publish the settings it asks for.
What it can do: Sendsets · What it can do: io.github.therealMrFunGuy/test-mailbox · Compare two other plugins
Data comes from the Official MCP Registry (registry.modelcontextprotocol.io), CC0 1.0. Data comes from public marketplace files in GitHub repositories of their authors. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.