Resend vs Mail Security Tools
Resend is an MCP server published by resend. Marketplaces we read that list it: 1 (Docker MCP Catalog). Mail Security Tools is an MCP server published by api.mailsecuritytools.com. Marketplaces we read that list it: 1 (Official MCP Registry). As of our marketplace pass on 2026-10-20. 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): 21 941 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 | Mail Security Tools |
|---|---|---|
| Marketplaces that list it | 1 | 1 |
| Stars (GitHub) (differs) | 576 | No figure on GitHub |
| Pulls (Docker Hub) (differs) | 21 941 | No figure on Docker Hub |
| Forks (GitHub) (differs) | 90 | No figure on GitHub |
| Last release (differs) | Not published | 2026-10-15 |
| Where it runs (differs) | On your machine (mcp/resend) | Remote server (api.mailsecuritytools.com/mcp) |
| 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 | Responded 23 h ago |
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.
Mail Security Tools
DMARC/SPF/DKIM/MX checks, email score, 100-domain bulk score, webhook watch alerts (x402 USDC).
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)
Mail Security Tools As a remote MCP server
claude mcp add --transport http email-security https://api.mailsecuritytools.com/mcpCommands built only from what the marketplaces declare; the full set for every client is on each card.
Only Mail Security Tools has a remote endpoint we check. How we check endpoints
Tools each declares
Only Resend has
send-email
Only Mail Security Tools has
bulk_email_security_scorecheck_domain_email_securitycheck_email_addressemail_fix_planemail_security_scorepricingwatch_status
Both have
None
Tool names as the marketplaces declare them and as Ext Ops observed them on the endpoints (Mail Security Tools as of 2026-10-19). More tools is not better in itself: compare what each needs for the job.
Settings each asks for
The marketplaces of Mail Security Tools publish no settings it asks for, so we do not compare settings.
What it can do: Resend · What it can do: Mail Security Tools · 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.