If you have Arbor set up to reroute email replies into Arbor, but aren't recieving the replies, you'll need to check your setup.
Go to School > School Details and click on your Imported Email Account. Select to manage your account and select Inbox.
You'll see a note saying "We are currently experiencing errors when importing emails from this mailbox and have therefore disabled it. Please contact Arbor.".
First, please check that your settings are correct. If they are not correct, once enabled the mailbox will become disabled again. This can happen for example if the password is wrong or has changed.
Once you have checked the settings, please contact the Arbor Support Team if supported by Arbor, or your Support Partner if not supported by Arbor to have this enabled again.