Email Provider Verification Guide

Gmail is the world's most popular email service with over 1.8 billion users. Gmail addresses use the @gmail.com domain, while businesses use Google Workspace with …

Microsoft 365 (formerly Office 365) and Outlook.com handle email for hundreds of millions of users. Business domains use Microsoft 365, while consumer accounts use @outlook.com, …

Yahoo Mail serves hundreds of millions of users across Yahoo, AOL, and related brands. Unlike Gmail and Microsoft, Yahoo typically reveals whether a mailbox exists …

ProtonMail (now Proton Mail) is a privacy-focused email provider based in Switzerland. It prioritizes user privacy, which extends to how it handles verification probes.

Zoho Mail is a business email platform popular with small and mid-sized businesses, especially those using the Zoho suite of business tools.

Apple's iCloud Mail serves hundreds of millions of Apple device users with @icloud.com, @me.com, and @mac.com domains.

Yandex Mail is the largest email provider in Russia and the CIS region, serving both consumer and business users.

GoDaddy provides email hosting for millions of small businesses, often powered by Microsoft 365 infrastructure. Behavior depends on the specific hosting configuration.

Fastmail is an Australian-based premium email provider known for privacy, reliability, and standards compliance. Popular with tech-savvy users and small businesses.

Self-hosted email servers running Postfix, Exim, or Sendmail are used by businesses, universities, and organizations that manage their own mail infrastructure.