When Credosity detects your signature it won't analyse below that point. But, this does depend on how you've set your signature up. If you have a HTML signature or other custom fancy one, Credosity may get confused and analyse the full email thread.
There's a reliable way around all this:
1. Select the text you want to analyse (as you normally would by dragging your mouse across the section to highlight it). You'll see the 'refresh' button icon change when you do this.
2. Click the 'Refresh' button in Credosity and the feedback will be specific to the bit you highlighted.
Sample emails wanted
If Credosity is analysing the full thread of your email we'd love your help. Please forward the email trail (assuming it's confidential, which is how we'll treat it) with your signature. We'll be able to use this 'real-world-fail' to improve this feature. Please forward your email to email@example.com