INDIVIDUAL MCP TOOL

check_blacklist

Check whether a sending domain or IP is currently on any of the major email blacklists that can push your mail to spam — a point-in-time reputation check across lists like Spamhaus, SpamCop, and Barracuda.

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 check_blacklist and invoke it with your own arguments.

Indexed input schema

{}

Risk classification

Potential side effects detected · medium confidence · heuristic, not a guarantee.

A tool name or description suggests sending messages.

Parent server

qualisend.com

CONNECT WITH APPROVAL

Client installation

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.

Related tools

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.