This can be done using two methods;
Method 1: Set an "Out of Office" style message through Webmail if you do not want replies from the TeamSideline communications that are sent out.
  1. Create a noreply@mymailname.com email box: Go to Communications > Mail Administration > Mailboxes and click the Add Mailbox button.
  2. Create an Admin account using the noreply@mymailname.com email address.
  3. Go to WebMail and setup an "Out of Office" message.
  4. Now you will select the noreply@mymailname.com email address when you send a TeamSideline communication out.

Method 2. Remove Mailbox redirect if you do not want any email sent to your email address to be redirected.
  1. Remove email redirect: Go to Communications > Mail Administration > Mailboxes and click the pencil icon to delete Redirect Email Address.
  2. Go to WebMail and setup an "Out of Office" message.