Resend vs Sickle — every mailbox for your agent
Resend is an MCP server published by resend. Marketplaces we read that list it: 1 (Docker MCP Catalog). Sickle — every mailbox for your agent is an MCP server published by sickle.app. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-10-17. 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 |  Resend | |
|---|---|---|
| Docker MCP Catalog | Listed Version: sha256:2a786579214e Forks (GitHub): 90 Pulls (Docker Hub): 21 869 Stars (Docker Hub): 5 Stars (GitHub): 576 Not marked · First seen |
Not listed |
| Official MCP Registry | Not listed | Listed Version: 1.1.0 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 | Resend | Sickle — every mailbox for your agent |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | 576 | No figure on GitHub |
| Pulls (Docker Hub) (differs) | 21 869 | No figure on Docker Hub |
| Forks (GitHub) (differs) | 90 | No figure on GitHub |
| Last release (differs) | Not published | 2026-10-16 |
| Where it runs (differs) | On your machine (mcp/resend) | Remote server (mcp.sickle.app) |
| Transport (differs) | stdio | Streamable HTTP |
| Tools it declares (differs) | 1 | Not published |
| Environment variables it asks for (differs) | 3, secrets among them: 1 | Not published |
| Licence (differs) | MIT | Not stated |
| Repository (differs) | github.com/resend/mcp-send-email | Not stated |
| Changes in the last 7 days (differs) | 0 | 4 |
| First seen (differs) | 2026-10-11 | 2026-10-14 |
| Endpoint at the last check (differs) | no remote endpoint we check | not checked yet |
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
Resend
The official MCP server to send emails and interact with Resend.
Sickle — every mailbox for your agent
Gmail, Outlook, iCloud, Fastmail and any IMAP mailbox for your agent. Scoped OAuth, approved sends.
How to run each
Resend As a local MCP server: Docker image
claude mcp add --env "RESEND_API_KEY=<YOUR_RESEND_API_KEY>" --transport stdio resend -- docker run -i --rm -e RESEND_API_KEY mcp/resendRequires: RESEND_API_KEY (secret)
Sickle — every mailbox for your agent As a remote MCP server
claude mcp add --transport http mail https://mcp.sickle.appCommands built only from what the marketplaces declare; the full set for every client is on each card.
Tools each declares
The marketplaces of Sickle — every mailbox for your agent publish no list of tools, so we do not compare tools.
Settings each asks for
The marketplaces of Sickle — every mailbox for your agent publish no settings it asks for, so we do not compare settings.
What it can do: Resend · What it can do: Sickle — every mailbox for your agent · Compare two other plugins
Data comes from the Docker MCP Catalog (desktop.docker.com/mcp/catalog) and Docker Hub. Data comes from the Official MCP Registry (registry.modelcontextprotocol.io), CC0 1.0. Figures come from our own regular passes over the marketplaces, last read on . We publish no contact details for plugin publishers.