Qualisend Email Verification

Qualisend verifies email addresses and cleans lists in real time to protect deliverability and sender reputation.

CommunityOnlineNo sign-inGlobalFreeCan modify data

What it can do

  • Verify Email: Verify a single email address — syntax, domain/MX, disposable + role detection, typo suggestion, and mailbox reachability. Returns a deliverability verdict (deliverable / risky / undeliv
  • Verify Emails: Verify up to 50 email addresses at once and get a deliverability verdict for each, synchronously. Consumes 1 credit per address. For larger lists (up to 1000), use verify_list.
  • Verify List: Verify a large list of up to 1000 email addresses. This runs ASYNCHRONOUSLY: it creates ONE bulk job, returns a job_id immediately, and the mailbox probes run in the background. Poll get_

What data it sees

Do you need an account

No: the server works without sign-in

Qualisend verifies email addresses and cleans lists in real time to protect deliverability and sender reputation.

Ask an agent to check a single address, a batch, or a whole list. Qualisend runs the full pipeline (syntax, domain/MX, disposable, role, catch-all, and a live SMTP mailbox probe) and returns a deliverable / risky / undeliverable / unknown verdict with a 0-100 confidence score.

Tools (12)

  • verify_email - verify one address
  • verify_emails - verify a ba
  • verify_list - verify a whol
  • get_credit_balance, `get_ves and look up past results
  • check_domain, generate_dnseader, check_disposable,check_typo, lookup_smtp_code - deliverability tools (Pro plan)
  • check_blacklist - blacklist / DNSBL checks (Blacklist Monitoring add-on)

Auth: OAuth 2.1 (connect wi no key copying) or an API key.New accounts get 100 free credits that never expire.

Website: https://www.qualisend.com Docs: https://www.qualisend.com

How to connect

How to connect Qualisend Email Verification to Claude

The server address to paste into Claude settings:

https://qualisend--hello-ovtj.run.tools

  1. Open Claude (claude.ai or the desktop app).
  2. Go to Settings → Connectors.
  3. Click Add custom connector.
  4. Paste the server address copied below into Remote MCP server URL and click Add.
  5. In a chat, click + → Connectors and switch the new connector on.

Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

Authorization

After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

How to connect Qualisend Email Verification to ChatGPT

The server address to paste into ChatGPT settings:

https://qualisend--hello-ovtj.run.tools

  1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
  2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
  3. Open Settings → Connectors and click Create.
  4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
  5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
  6. In a new chat open + → Apps/Connectors and enable the connector.

OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

Authorization

On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

How to connect Qualisend Email Verification to Cursor

The server address to paste into Cursor settings:

https://qualisend--hello-ovtj.run.tools

Fastest: click Open in Cursor below and confirm the prompt.

Manually:

  1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
  2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
  3. Save the file. The server appears in the MCP list; authorize it there if asked.

Authorization

If the service needs sign-in, an authorize button appears next to the server in the MCP list.

Server tool list (12)

Raw names from tools/list. Only developers need these.

verify_emailVerify a single email address — syntax, domain/MX, disposable + role detection, typo suggestion, and mailbox reachability. Returns a deliverability verdict (deliverable / risky / undeliverable / unknown). Consumes 1 credit.
verify_emailsVerify up to 50 email addresses at once and get a deliverability verdict for each, synchronously. Consumes 1 credit per address. For larger lists (up to 1000), use verify_list.
verify_listVerify a large list of up to 1000 email addresses. This runs ASYNCHRONOUSLY: it creates ONE bulk job, returns a job_id immediately, and the mailbox probes run in the background. Poll get_verification with the job_id for progress and a result summary (counts by verdict). Consumes 1 credit per address. For lists larger than 1000, use the Qualisend dashboard or bulk API.
get_credit_balanceReturn the number of verification credits available in your Qualisend workspace.
get_verificationLook up the status and result of a verification you started, by job_id (returned from verify_email/verify_emails). For a single check it returns the final verdict once the mailbox probe completes; for a batch it returns progress + a result-mix summary.
check_domainCheck 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. A plain deliverability health check for a sending domain. No credit used. Available on the Qualisend Pro plan.
generate_dns_recordCreate the exact DNS setting a domain needs so its email is trusted and harder to spoof — SPF, DMARC, BIMI, or MTA-STS. Returns the record to copy into DNS, with where to put it. No credit used. Available on the Qualisend Pro plan.
analyze_email_headerRead 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. Paste the message source / 'Show original'. No credit used. Available on the Qualisend Pro plan.
check_disposableTell whether an email address is a throwaway/temporary one, a generic team inbox (like info@ or support@), or a free consumer address (like gmail) — useful for spotting low-quality sign-ups. No credit used. Available on the Qualisend Pro plan.
check_typoSpot a likely typo in an email's domain (like gmial.com) and suggest the correct one, so you don't lose contacts to misspelled addresses. No credit used. Available on the Qualisend Pro plan.
lookup_smtp_codeExplain a mail-server reply/error code (like 550 or 5.1.1) in plain English, and say whether it's a temporary hiccup or a permanent failure. No credit used. Available on the Qualisend Pro plan.
check_blacklistCheck 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. No credit used. Requires the Qualisend Blacklist Monitoring add-on.