How to allow a user to send as another user also called delegate. Useful for mailbox accounts (admissions, office of the president, etc)

You can delegate access to your Gmail to another person so they can read, send, and delete messages on your behalf. For example, you can delegate e-mail rights to an admin in your organization, or you could delegate your personal email access to your spouse. You  can specify up to 25 users as delegates. 

Here's how:

Click the gear icon in the upper right, then select Settings.Select the Accounts and Import tab.Under 'Grant access to your account,' click the Add another account link.Enter the email address of the person you'd like to access your account and click Next Step. Remember you can only enter a Google Mail address.You'll see a confirmation message.

Click Send email to grant access if you're sure.The delegate will receive a verification email explaining that you've granted access to them.

After the delegate confirms this request, it may take up to 30 minutes for the verification process to be completed. To see if the delegate has confirmed access to your account, look at the Accounts tab in Settings
Any messages someone else sends from your account will have your name listed in addition to the other person's name, so they'll show the sender as: Your Name (sent by Delegate).

If someone has granted access to their account to you, you can access it by clicking the down-arrow next to your email address in the upper-right corner. Click Switch account and choose your delegate's email address.
Remove delegated access to your account

If you no longer want to grant somebody else access to your account, follow these instructions:
Click the gear icon in the upper right, then select Settings.Click the Accounts and Import tab.In the ""Grant access to your account"" section, click delete on any account you want to remove.
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