You can respond to email messages from your User Mailbox (hybrid) self-service dashboard. You can reply or reply all to an email message.
To be able to reply to message, ensure you have enabled message replies.
Procedure
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From the navigation pane, go to Protect > Exchange.
The Exchange Overview page appears.
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Click the user account in the upper-right area, and then go to View > Self-service view.
The Self-service dashboard appears.
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On the Self-service dashboard, in the Exchange section, click Restore.
The message selection page appears.
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From the email list, select a message.
In the right pane, a preview of the message appears.
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You can perform the Reply or Reply all functions from the message preview pane:

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Based on your requirement, click Reply or Reply all.
A draft message screen appears.
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Fill out the fields you require, and then click Send in the upper-left area of the page.
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To: Enter the email address of the recipient.
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Cc: Enter the email address of the recipient you wish to keep in Cc.

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Note
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You can add Bcc recipients using the Bcc button.
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You can also insert email attachments using the Insert button.
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When you select the Reply all option, the To and Cc fields will be auto-populated based on the message you are responding to.
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