You can configure the email address of the sender account along with the reply-to  email addresses as long as you're the Admin or the Department Admin. You can either choose to send the email with the admin's email address in the from field or choose to set up a uniform custom email address for every email sent from your organization.

This feature is available only in trial and paid editions.

Steps:

   1. Go to Settings and select Email Configuration under Email Settings.

   2. If every email sent should have the email address of the member in the from/reply-to field choose Organizer's / Host's email address for webinar and meeting. 

   3. If you want every email sent from your organization to have a uniform sender email address, then enter the email ID in the Custom Email field and click VERIFY. The setup will be completed once verified.

Note 

1. Verifying the email ID entered in the Custom Email field is mandatory until which emails sent will have the previously configured email address In the from/reply-to field. 
   
2. This setting is specific to the department and the service you apply to.