IC Professionals frequently have to send communications on behalf of stakeholders across their organisation or on behalf of the organisation itself. Rather than sending from a generic or shared inbox, Sender Details allow you to manipulate who the message appears to have come from.
For instance, if you're sending a message for your CEO, Changing the Sender Details to the CEO's name and email address means that it will look like the CEO has sent the message themselves when your audience receive the communication in their inbox. You can then save your sender details to appear by default when sending from you Folder. (You can also Personalise the Sender Details)
Sender details are broken into 3 fields:
From Name: This is the name that will appear in the From field of your inbox, e.g. Joe Blogg, CEO, etc...
From Email: The email address of the person you are sending on behalf of, e.g. CEO@poppulo.com.
Reply to Email: This is the email that your audience will respond to if they reply to your email.
Important: It is usually the From Email address which receives automatic out of office notifications. This behaviour is controlled on the receiving end. If you're not sure how it's set up in your case, please check with your IT Team. The Reply to Email address, in most setups, should be used for manual replies from the recipients, where they click the reply button in their email client.