Mailtrap vs Nestr MCP
A side-by-side look at the Mailtrap and Nestr MCP MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose Mailtrap for communication work as a local process; choose Nestr MCP 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 Mailtrap when
- You need dedicated capabilities in the Communication domain.
- You prefer a local stdio subprocess transport.
- You have the keys it needs:
MAILTRAP_API_TOKEN, MAILTRAP_ACCOUNT_ID, DEFAULT_FROM_EMAIL, MAILTRAP_SANDBOX_ID, MAILTRAP_TEST_INBOX_ID, MAILTRAP_ORGANIZATION_ID, MAILTRAP_ORGANIZATION_API_TOKEN. - You want tools like
send-email, batch-send-transactional-email, batch-send-bulk-email.
Choose Nestr MCP 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:
NESTR_API_KEY, NESTR_OAUTH_TOKEN. - You want tools like
nestr_list_workspaces, nestr_get_workspace, nestr_create_workspace.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Communication | Communication |
| Quality signal | 64/100 · Good | 60/100 · Good |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Local subprocess (stdio) |
| Auth | Not declared | API key required |
| Pricing | Not declared | Not declared |
| Required env vars | MAILTRAP_API_TOKENMAILTRAP_ACCOUNT_IDDEFAULT_FROM_EMAILMAILTRAP_SANDBOX_IDMAILTRAP_TEST_INBOX_IDMAILTRAP_ORGANIZATION_IDMAILTRAP_ORGANIZATION_API_TOKEN | NESTR_API_KEYNESTR_OAUTH_TOKEN |
| Verified owner | Community listing | Community listing |
| GitHub stars | 66 | 6 |
| Directory activity | 3 views 0 installs 0 upvotes | 0 views 0 installs 0 upvotes |
| Tools | 125 | 69 |
| Full listing | View Mailtrap | View Nestr MCP |
Tools & capabilities
Mailtrap tools 125
send-emailSend an email to your recipient email address using Mailtrap Email API. You can send emails to multiple recipients at once.batch-send-transactional-emailSend a batch of transactional emails in one Mailtrap API call. Shared fields go on `base`; per-recipient overrides go in `requests[]`. Each request must include `to`.batch-send-bulk-emailSend a batch of bulk emails (Mailtrap bulk-stream API) in one call. Shared fields go on `base`; per-recipient overrides go in `requests[]`. Each request must include at least one of `to`/`cc`/`bcc`.create-templateCreate a new email templatelist-templatesList the account's email templates with page-token pagination (`token`, `per_page`). Pages are offsets over the newest-first list, so after deleting templates list again from token 1 instead of continuing with the next token.get-templateGet a single email template by ID, including subject, category, and HTML/text body.update-templateUpdate an existing email templatedelete-templateDelete an existing email templatesend-sandbox-emailSend an email in sandbox mode to a test inbox without delivering to your recipientsbatch-send-sandbox-emailSend a batch of emails in sandbox mode to a test inbox in one Mailtrap API call. Shared fields go on `base`; per-recipient overrides go in `requests[]`. Requires `sandbox_id` or the MAILTRAP_SANDBOX_ID env var.get-sandbox-messagesGet list of messages from the sandbox test inboxshow-sandbox-email-messageShow sandbox email message details and content from the sandbox test inbox. Optionally include spam report (SpamAssassin score) and HTML analysis (client compatibility) for email testing workflows.- +113 more on the listing page
Nestr MCP tools 69
nestr_list_workspacesList accessible workspacesnestr_get_workspaceGet workspace detailsnestr_create_workspaceCreate a new workspace (OAuth only)nestr_searchSearch for nests (tasks, projects, roles)nestr_get_meGet current user identity and workspace listnestr_get_nestGet details of a specific nest (supports batch fetch with comma-separated IDs; single-nest `provenance`/`rights`/`whoCan` flags available)nestr_explain_nestDiagnose one nest: field/property provenance (which label/circle defines each), the caller's composed rights with a deny trace, and (with `whoCan`) who can act on it and who to contactnestr_get_nest_childrenGet child nestsnestr_create_nestCreate a new nestnestr_update_nestUpdate nest propertiesnestr_delete_nestDelete a nestnestr_reorder_nestReorder a nest relative to another- +57 more on 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.
Mailtrap
{
"mcpServers": {
"mailtrap": {
"command": "npx",
"args": [
"-y",
"mcp-mailtrap"
],
"env": {
"MAILTRAP_API_TOKEN": "YOUR_MAILTRAP_API_TOKEN_HERE",
"MAILTRAP_ACCOUNT_ID": "YOUR_MAILTRAP_ACCOUNT_ID_HERE",
"DEFAULT_FROM_EMAIL": "YOUR_DEFAULT_FROM_EMAIL_HERE",
"MAILTRAP_SANDBOX_ID": "YOUR_MAILTRAP_SANDBOX_ID_HERE",
"MAILTRAP_TEST_INBOX_ID": "YOUR_MAILTRAP_TEST_INBOX_ID_HERE",
"MAILTRAP_ORGANIZATION_ID": "YOUR_MAILTRAP_ORGANIZATION_ID_HERE",
"MAILTRAP_ORGANIZATION_API_TOKEN": "YOUR_MAILTRAP_ORGANIZATION_API_TOKEN_HERE"
}
}
}
}
Nestr MCP
{
"mcpServers": {
"mcp-348": {
"command": "npx",
"args": [
"-y",
"@nestr/mcp"
],
"env": {
"NESTR_API_KEY": "YOUR_NESTR_API_KEY_HERE",
"NESTR_OAUTH_TOKEN": "YOUR_NESTR_OAUTH_TOKEN_HERE"
}
}
}
}
Frequently asked questions
Mailtrap is categorized under Communication and uses a local stdio subprocess. Nestr MCP belongs to Communication and uses a local stdio subprocess. Pick Mailtrap for communication work and Nestr MCP 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.
Mailtrap has no declared pricing — check the project's own site. Nestr MCP has no declared pricing — check the project's own site. 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 mailtrap and mcp-348 as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Mailtrap has a quality signal of 64/100 (Good) with 3 views, 0 installs and 66 GitHub stars. Nestr MCP has 60/100 (Good) with 0 views, 0 installs and 6 GitHub stars.