There's a reason Gmail is the world's most popular e-mail program with 1.5 billion users. It has more features than rivals.

Are you using them?

Would you like to make your phone calls to your e-mail program or translate to French e-mail into English, right from within Gmail? Google's free e-mail program, which turned 15 this week, continues to innovate.

Here are seven things you can do with Gmail that you can not do with AOL, Yahoo or Microsoft Outlook.com or Hotmail.

Translate e-mails is a Gmail feature (Photo: Screenshot)

Make free phone calls

Technically, Microsoft lets you do this, too, via Outlook.com, but it takes you out of the program and over to Skype. In Gmail, just click "Make a call," at the bottom of the left-hand screen, type in your contact number and connect via your webcam mic. Calls to the United States and Canada are free and connected to Google's Hangouts app for the call.

Translate to other languages

When an e-mail arrives in a foreign language, depending on which version you are using, you can click "View translated message" at the top of the e-mail or click here. Translate message to "to reveal that option – and voila," it will be English, or any number of languages ​​from Afrikaans or Albanian to Yiddish or Zulu.

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Have the robot help compose your sentences

With Google's Smart Assist, Google's artificial intelligence figures out what you're trying to say and auto-completes the sentence for you. It also offers responses in an email to save you some keystrokes. For instance, in the example below, we typed "What time do you want to meet" and Google added "tomorrow?" On another e-mail, it throws in "will do" and "got it," as appropriate responses.

Send disappearing Gmails

It's not Snapchat, but it's a similar idea. You may have an expiration date on your Gmail and have it expires within a certain period of time. You can even add an extra layer of confidential protection by requiring a password that is sent to the recipient by text message.

Request money or pay a friend directly within Gmail

Apple has this feature in the iChat program, but Google has it built directly into Gmail. You can request money directly from within the mail – but first, you and your friend will be registered for Google Pay.

Only see the good stuff

In Gmail, Google separates the most important communications in the "Primary" folder and puts it in two other categories, Social and Promotion. So, do not clog up your main inbox.

Schedule e-mails in advance.

This is a new feature that is coming to Gmail shortly, for the company. When you click send, you 'll be given a choice of having a date or a date.

Readers: What's your favorite Gmail feature? Tell us about it on Twitter, where I'm @jeffersongraham

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