Letterkeel: Send Email via SMTP, Resend, SendGrid & Mailgun vs io.github.Creativestefan/mailbridge
Letterkeel: Send Email via SMTP, Resend, SendGrid & Mailgun is an MCP server published by cybermax.cybermax-tools.workers.dev. Marketplaces we read that list it: 1 (Official MCP Registry). io.github.Creativestefan/mailbridge is an MCP server published by Creativestefan. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-10-24. 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 |  Letterkeel: Send Email via SMTP, Resend, SendGrid & Mailgun |  io.github.Creativestefan/mailbridge |
|---|---|---|
| Official MCP Registry | Listed Version: 1.0.1 No figure published Not marked · First seen |
Listed Version: 2.6.1 Downloads/month (npm): 355 Downloads/week (npm): 35 Forks (GitHub): 0 Stars (GitHub): 2 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 | Letterkeel: Send Email via SMTP, Resend, SendGrid & Mailgun | io.github.Creativestefan/mailbridge |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | No figure on GitHub | 2 |
| Forks (GitHub) (differs) | No figure on GitHub | 0 |
| Last release | Not published | Not published |
| Where it runs (differs) | Remote server (mcp.apify.com) | On your machine (mailbridge-mcp) |
| Transport (differs) | Streamable HTTP | stdio |
| Tools it declares | Not published | Not published |
| Environment variables it asks for | Not published | Not published |
| Licence (differs) | Not stated | MIT |
| Repository (differs) | Not stated | github.com/creativestefan/mailbridge-mcp |
| Changes in the last 7 days | 0 | 0 |
| First seen | 2026-10-11 | 2026-10-11 |
| Endpoint at the last check (differs) | Not responding since 2026-10-24 | no remote endpoint we check |
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
Letterkeel: Send Email via SMTP, Resend, SendGrid & Mailgun
Letterkeel: send email from your own domain via SMTP, Resend, SendGrid, Mailgun, Postmark
io.github.Creativestefan/mailbridge
Connect your AI assistant to email — read, search, send, and organise via IMAP/SMTP.
How to run each
Letterkeel: Send Email via SMTP, Resend, SendGrid & Mailgun
No data for an automatic command: what its marketplaces declare does not say unambiguously how to connect it.
Requires: Authorization header
io.github.Creativestefan/mailbridge As a local MCP server: npm package
claude mcp add --transport stdio mailbridge -- npx -y mailbridge-mcpCommands built only from what the marketplaces declare; the full set for every client is on each card.
Only Letterkeel: Send Email via SMTP, Resend, SendGrid & Mailgun 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: Letterkeel: Send Email via SMTP, Resend, SendGrid & Mailgun · What it can do: io.github.Creativestefan/mailbridge · 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.