Exchange 2013 work needed

We have an Microsoft Exchange 2013 server and a SharePoint 2007 server. First off, there's a SharePoint form that staff fills out and a workflow that e-mails certain details about the form. Problem is that the e-mail often ends up in Outlook's Junk Email folder. Doing some research it seems a transport rule can be set to set the SCL value for that system to -1. Not really sure how to do this and if that's the correct thing to do. Secondly, we're having some issues with searching through Outlook. Some items show up when searching, some don't. Service is running on the server. Would like to know your pre-thoughts and would need documentation of changes made.