Email MCP vs Sendmux Sdk
A side-by-side look at the Email MCP and Sendmux Sdk MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose Email MCP for communication work as a local process; choose Sendmux Sdk for communication as a local process. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Email MCP when
- You need dedicated capabilities in the Communication domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: other.
- You want tools like
email_list_accounts, email_add_account, email_remove_account.
Choose Sendmux Sdk when
- You need dedicated capabilities in the Communication domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: API key required.
- You have the keys it needs:
SENDMUX_MCP_SURFACES, SENDMUX_API_KEY, SENDMUX_MAILBOX_API_KEY, SENDMUX_MANAGEMENT_API_KEY, SENDMUX_SENDING_API_KEY, SENDMUX_MCP_TRANSPORT, SENDMUX_MCP_HTTP_BEARER_TOKEN, SENDMUX_MCP_TIMEOUT_SECONDS.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Communication | Communication |
| Quality signal | 68/100 · Great | 47/100 · Fair |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Local subprocess (stdio) |
| Auth | other | API key required |
| Pricing | Free | BYOK (pay the provider) |
| Required env vars | None listed | SENDMUX_MCP_SURFACESSENDMUX_API_KEYSENDMUX_MAILBOX_API_KEYSENDMUX_MANAGEMENT_API_KEYSENDMUX_SENDING_API_KEYSENDMUX_MCP_TRANSPORTSENDMUX_MCP_HTTP_BEARER_TOKENSENDMUX_MCP_TIMEOUT_SECONDS |
| Verified owner | Community listing | Community listing |
| GitHub stars | 26 | 62 |
| Directory activity | 8 views 0 installs 0 upvotes | 3 views 0 installs 0 upvotes |
| Tools | 33 | Not listed |
| Full listing | View Email MCP | View Sendmux Sdk |
Tools & capabilities
Email MCP tools 33
email_list_accountsList all configured email accounts and their connection statusemail_add_accountAdd a new IMAP or iCloud email account (Gmail and Outlook require the setup wizard for OAuth)email_remove_accountRemove an email account: deletes its stored credentials, revokes the Google grant for Gmail accounts, and removes Outlook tokens from the local token cache. The result reports whether provider-side revocation succeeded.email_test_accountTest an email account connectionemail_list_foldersList all email folders for an accountemail_searchSearch emails with filters. By default returns compact results without full body content to save context. Set returnBody=true to include full email bodies.email_getGet a single email by IDemail_get_threadGet an email thread by thread IDemail_get_attachmentGet an email attachment by ID, returns base64 encoded dataemail_save_attachmentDownload an email attachment and save it directly to disk, returning metadata only (no base64 in the response) — avoids paying the token cost of round-tripping large attachments through the calling model. outputPath is relative to a fixed downloads directory (/home/user/.email-mcp/downloads, override with EMAIL_MCP_DOWNLOADS_DIR) and cannot escape it.email_sendSend a new emailemail_replyReply to an existing email- +21 more on the listing page
Sendmux Sdk tools
No tool names declared yet. Check the project README from the listing page.
Ready-to-paste client configs
Paste either block (or both) into your client config, e.g. claude_desktop_config.json or ~/.cursor/mcp.json. We only show a config when the install command is confirmed.
Email MCP
{
"mcpServers": {
"marlinjai-email-mcp": {
"command": "npx",
"args": [
"-y",
"@marlinjai/email-mcp"
]
}
}
}
Sendmux Sdk
{
"mcpServers": {
"sendmux-sendmux-sdk": {
"command": "uvx",
"args": [
"sendmux-mcp"
],
"env": {
"SENDMUX_MCP_SURFACES": "YOUR_SENDMUX_MCP_SURFACES_HERE",
"SENDMUX_API_KEY": "YOUR_SENDMUX_API_KEY_HERE",
"SENDMUX_MAILBOX_API_KEY": "YOUR_SENDMUX_MAILBOX_API_KEY_HERE",
"SENDMUX_MANAGEMENT_API_KEY": "YOUR_SENDMUX_MANAGEMENT_API_KEY_HERE",
"SENDMUX_SENDING_API_KEY": "YOUR_SENDMUX_SENDING_API_KEY_HERE",
"SENDMUX_MCP_TRANSPORT": "YOUR_SENDMUX_MCP_TRANSPORT_HERE",
"SENDMUX_MCP_HTTP_BEARER_TOKEN": "YOUR_SENDMUX_MCP_HTTP_BEARER_TOKEN_HERE",
"SENDMUX_MCP_TIMEOUT_SECONDS": "YOUR_SENDMUX_MCP_TIMEOUT_SECONDS_HERE"
}
}
}
}
Frequently asked questions
Email MCP is categorized under Communication and uses a local stdio subprocess. Sendmux Sdk belongs to Communication and uses a local stdio subprocess. Pick Email MCP for communication work and Sendmux Sdk for communication.
Copy the mcpServers block from the config section on this page into your client's config (for example claude_desktop_config.json or ~/.cursor/mcp.json), then fully restart the client.
Email MCP is listed as free. Auth: other. Sendmux Sdk is bring-your-own-key: usage is billed by the API provider you supply a key for. Auth: api key required. If a server needs environment variables such as API keys, define them under the env key in your client's MCP config.
Yes. MCP clients support multiple servers: add marlinjai-email-mcp and sendmux-sendmux-sdk as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Email MCP has a quality signal of 68/100 (Great) with 8 views, 0 installs and 26 GitHub stars. Sendmux Sdk has 47/100 (Fair) with 3 views, 0 installs and 62 GitHub stars.