Email Provider Checker

The Email Provider Checker reads a list of email addresses and tells you which mailbox provider sits behind each one, grouping every contact into recognisable buckets such as Gmail, Outlook, Yahoo, Proton Mail, iCloud, AOL, Zoho, or a custom business domain. Instead of guessing from a raw address, you get a clean table that pairs every email with its domain and the friendly name of the service that actually delivers its mail.

This matters because different providers behave differently. Gmail and Outlook have their own filtering quirks, sending limits, and reputation signals, while business domains often indicate a decision-maker rather than a personal account. Knowing the split across your list helps you plan deliverability, tune sending volume per provider, and segment personal versus professional contacts before a campaign ever leaves your outbox.

Everything runs locally in your browser using JavaScript, so your list is never uploaded and no account is required. Paste or upload your addresses, click the button, and read the per-address table plus a summary that counts how many contacts belong to each provider. Because nothing leaves your device, the tool is safe for confidential prospect lists and regulated contact data alike.

Features

• Maps every address to a friendly provider name such as Gmail, Outlook, Yahoo, Proton Mail, iCloud, AOL, GMX, Zoho, or Yandex.
• Recognises provider aliases including googlemail, ymail, rocketmail, hotmail, live, msn, me, and mac so related domains group correctly.
• Labels anything outside the known consumer providers as a custom or business domain for easy segmentation.
• Handles country-code domains like gmail.co.uk by inspecting the significant label rather than only the final suffix.
• Builds a per-address table showing the email, its extracted domain, and the detected provider side by side.
• Summarises the whole list with counts for each provider so you can see the balance at a glance.
• Exports the table to CSV, XLSX, or TXT, or copies it to the clipboard for pasting into a spreadsheet.

How to use Email Provider Checker

1. Paste your email addresses into the input box, or upload a .txt or .csv file from your own device.
2. Click the Check providers button to scan every address and detect its mailbox host.
3. Review the table to see the provider name and domain matched to each individual email address.
4. Read the stats panel to see how many contacts belong to Gmail, Outlook, Yahoo, and other providers.
5. Sort or scan the results to spot business domains you may want to prioritise in outreach.
6. Export the table to CSV, XLSX, or TXT, or copy it for import into your CRM or sending tool.

Benefits

• Helps you segment personal consumer accounts from professional business domains before you send.
• Lets deliverability-focused senders balance volume per provider to avoid tripping Gmail or Outlook limits.
• Gives sales teams a quick read on how many leads use company domains versus free mailboxes.
• Saves manual sorting because the provider name and domain are extracted automatically for every row.
• Keeps confidential lists private since all detection happens in your browser with nothing uploaded.
• Provides a fast overview of list composition that informs messaging, timing, and warm-up strategy.

Provider detection works by extracting the domain from each address and comparing its significant label against a curated map of consumer mailbox services. Country-code second-level domains such as .co.uk or .com.au are handled so that gmail.co.uk is still recognised as Gmail rather than being misread. Addresses whose domains are not in the consumer map are grouped as custom or business, which is usually the strongest signal that you are looking at a company mailbox.

The tool identifies the delivering service by domain, not by verifying the mailbox, so it confirms where mail would be routed rather than whether the address is currently active. Some organisations route their custom domains through Google Workspace or Microsoft 365, which this format-based check cannot see from the address alone. Treat business-labelled rows as company domains and pair the results with a syntax or list-cleaning pass for the sharpest segmentation.