Gmail
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https://mail.google.com/mail?hl=en
About Gmail - Email. Chat. Video. Phone. - Google
...Gmail goes beyond ordinary email. You can video chat with a friend, ping a colleague, or give someone a ring ? all without leaving your inbox. The ease and simplicity of Gmail is available on the go. Download the app from Google Play or the Apple App Store to get started....
https://www.gmail.com/mail/help/intl/en-US/about.html?__shortid__=1wZ9