Jive SBS uses an SMTP email server for sending messages such as content update notifications, task reminders, registration confirmations, and so on. You can configure the connection to an outgoing email server with the admin console.
Admin Console: System > Settings > Email Server
Set the server admin email and name in order to have a default email address and name for outgoing email. In practice, outgoing emails can appear to have been sent by any one of many people, depending on the reason for the message. For example, when someone posts a message to a discussion thread, the email can appear to have come from them and will be received by anyone receiving notifications for the message.
Set the bounce email address to collect bounced emails. For example, if a outgoing email bounces because its recipient is no longer available, the returning email will be sent to this address. It's a good way to keep this kind of email from cluttering the inbox of an address that you use for other purposes.
Select the Set Username in Notification Email From Address, when you want a person's username used on the FROM line of a notification email rather than their full name. In other words, if someone posts a discussion reply message, notification messages sent to other people will show the FROM line as, for example, "gladysk" rather than "Gladys Kravitz".