We do not currently support sending emails using an alias in our web app. However, we do support sending emails with an alias in the extension.
How to send an email with an alias in the Copper Extension. Don't have the extension? Download it here:
1. Go to gmail -> sign into the extension
2. Go to a person record and click the envelope icon if you want to use email templates, or click on the email of the person, if you want to send a regular Gmail email
3. Click on the dropdown next to your From email
4. Choose your alias and send from your alias!