INDIVIDUAL MCP TOOL

lookup_smtp_code

Explain a mail-server reply/error code (like 550 or 5.

qualisend.comnone authenticationAvailability not checked

LIVE ENDPOINT

https://app.qualisend.com/api/mcp

No auth detected

Connect to this endpoint to inspect the live schema for lookup_smtp_code and invoke it with your own arguments.

{}

Inferred read-only · medium confidence · heuristic, not a guarantee.

No write-capable action terms were found; this is not proof that invocation has no side effects.

CONNECT WITH APPROVAL

Review this server and its permissions before adding it. Secret placeholders must be set locally.

Codex

~/.codex/config.toml

[mcp_servers.qualisend]
url = "https://app.qualisend.com/api/mcp"
enabled = true

Claude Code

.mcp.json

{
  "mcpServers": {
    "qualisend": {
      "type": "http",
      "url": "https://app.qualisend.com/api/mcp"
    }
  }
}

Claude Desktop

Settings → Connectors → Add custom connector

Name: qualisend
Remote MCP URL: https://app.qualisend.com/api/mcp

Add this remote URL as a custom connector in Claude Desktop. Availability depends on the user plan and workspace policy.

Cursor

.cursor/mcp.json

{
  "mcpServers": {
    "qualisend": {
      "url": "https://app.qualisend.com/api/mcp"
    }
  }
}

Visual Studio Code

.vscode/mcp.json

Add to Visual Studio Code

{
  "servers": {
    "qualisend": {
      "type": "http",
      "url": "https://app.qualisend.com/api/mcp"
    }
  }
}

Generic MCP

Client-specific MCP configuration

{
  "name": "qualisend",
  "transport": "streamable-http",
  "url": "https://app.qualisend.com/api/mcp"
}

MCP Inspector

Run the official MCP Inspector locally and enter the indexed Streamable HTTP endpoint.

verify_email — Verify a single email address — syntax, domain/MX, disposable + role detection, typo suggestion, and mailbox reachability.
verify_emails — Verify up to 50 email addresses at once and get a deliverability verdict for each, synchronously.
verify_list — Verify a large list of up to 1000 email addresses.
get_credit_balance — Return the number of verification credits available in your Qualisend workspace.
get_verification — Look up the status and result of a verification you started, by job_id (returned from verify_email/verify_emails).
check_domain — Check whether a domain is set up to send email that reaches the inbox — its mail servers plus its SPF and DMARC sender-authentication, and what's missing.
generate_dns_record — Create the exact DNS setting a domain needs so its email is trusted and harder to spoof — SPF, DMARC, BIMI, or MTA-STS.
analyze_email_header — Read the hidden technical details of an email (its 'headers') to show the route it took, how long each step took, and whether it passed spam/authentication checks — handy for figuring out why a message was slow or went to spam.