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Log in to your class and click the Students tab.
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To email one student, click the envelope icon to the right of the student’s name.
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To email more than one student, check the boxes next to the students you want to email and click the Email button.
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To email all students in the class, check the top box on the left, which selects all of the students.
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In the New Message window (see Figure 1), type in a subject and your message.
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Click Send. Your message is sent to your students.
At the bottom of the New Message window, you can use the formatting tools to format your text, just like in Gmail. You can also attach documents using the paperclip and Google Drive icons.
Students also have the ability to send emails to other students. Rather than a Students tab, students see a Classmates tab, which lists everyone in the class. They have the same capabilities for sending emails as described above.
Source: Google.com