Connect mailfloss to Claude
Connect your mailfloss account to Claude to check an email address, see your remaining credits, or ask which email platforms you have connected. You can use plain English instead of API commands.
Before you start
You need a Claude account and a mailfloss account. Sign in to Claude on the web or in the desktop app. On a Team or Enterprise plan, your organization may need to make the connector available first. Ask an organization Owner if you see a request button instead of a connection button.
Email verification uses mailfloss credits. Verifying one address costs one credit per call, including when you check the same address again. Checking your remaining credits, usage, or list of connected platforms is free. Review Claude's tool permissions before allowing it to run tools automatically.
Add mailfloss and sign in
- In Claude, open Customize, then Connectors. Choose Discover and search for mailfloss. You can also open the mailfloss connector listing.
- Open the listing and choose Connect to Claude. If you opened the listing while signed out of Claude, sign in first.
- Sign in to your mailfloss account on the page that opens. Review the requested access and approve the connection. Claude uses the access allowed by your mailfloss account's role.
- Back in Claude, open Customize → Connectors → Yours. mailfloss should show a check mark in the Status column.
- Open a chat. Select + in the message box, then Connectors, and turn on mailfloss for that conversation.
You do not need to create an API key for this sign-in flow. If you use the desktop app, the mailfloss sign-in page opens in your browser.
Try a request
Start with a question that reads account information:
Or:
To check one address, replace [email address] with the address you want to verify:
These are example requests, not recorded conversations. The result depends on the address you provide. mailfloss reports a status such as passed, undeliverable, risky, or unknown; ask Claude to explain the reason alongside it. An unknown result is not a confirmed pass.
Claude may ask for permission before using a tool. Read the request before approving it. Whether it asks again depends on your tool permissions. The mailfloss MCP guide lists the available tools and their costs, including list verification.
Turn off, disconnect, or reconnect
To stop using mailfloss in one conversation, switch it off in the chat's + → Connectors menu. This leaves your account connected.
To disconnect in Claude, open Customize → Connectors → Yours, select mailfloss, and choose Disconnect. To remove the listing from your Claude account, use Remove in its three-dot menu. Organization-wide removal on Team or Enterprise is managed by an Owner.
You can also disconnect a client from the mailfloss dashboard under Account Settings → Connected apps.
If Claude shows Reconnect, select it and sign in again.
If something does not work
- You cannot connect on a Team or Enterprise account: ask an organization Owner to make the connector available, then connect your own mailfloss account.
- Claude is not using mailfloss in a chat: check that the mailfloss toggle is on for that conversation. Open the connector's Tool permissions to check whether the tool is blocked or needs approval.
- You need to connect a new email platform: do that in the mailfloss dashboard. The connector's tools work with the platform connections you already have.
For more detail about Claude's controls, see Anthropic's connector setup guide. For tool reference and technical setup, see the mailfloss MCP guide.