However, the Outlook/Exchange doesn’t appear to offer Pause, same for me (see image 1), I just enabled the provider for this check (I don’t use MS Outlook). But, since this is a plug-in rather than a provider and as such is an integral part of Outlook pause might not be an option.
Could this be happening because it is scanning archived messages on open (see image 2), try uncheckng this option and see if that is the cause.