How to use this feature
Go to the gear symbol at the top right corner of the page and select Integrations from the dropdown menu.
Click on 'integrate with additional service' and select Gmail. You will be redirected to your Google account page. Select the Gmail address you'd like the emails to come from (it doesn't have to be the same as your account email address), and accept the permissions:
You will get a confirmation message and your emails will start going out via your Gmail account. You will be able to see them in your Outbox. Any "Out of office" replies or bounce back messages will be delivered straight to you so you will know if a client hasn't received an email for any reason.
Custom 'from' address
If you have set a custom 'from' address on the Afterwards tab > 'email to user',
it will be overriden by this option; all emails will be sent from the account you selected for gmail integration.