Gmail leads with 15GB storage and 25MB attachment limit. Outlook.com offers Focused Inbox with machine learning sorting. Neo provides up to 50GB storage for businesses. Yahoo Mail delivers 1TB storage with marketing ads. Proton Mail focuses on security with end-to-end encryption
Gmail launched in 2004 as Google's email service with 1GB storage. Reached 1.5 billion active users worldwide by 2019. Initially kept secret from Google engineers, later became public
Email clients are installed applications for managing emails on computers. Webmail is accessed through internet browsers without installation
Hotmail launched in 1996 by Sabeer Bhatia and Jack Smith as world's first webmail. Service initially ran on Solaris and FreeBSD, later migrated to Windows. Microsoft acquired Hotmail for $400 million in 1997
Mail.com offers free email accounts with 65 GB storage. Over 100 domain names available for registration. Users can create up to 10 email addresses simultaneously
Email address appears in From field when starting new message. Echo service can show email address in response. Multiple email addresses can be configured in From line