MacOS – make a shared link in Mail.app appear above the signature

When I click the Share arrow in Yosemite / Safari, then select 'Email this page' Mail.app opens a new email with my signature and the link below the signature:

I want the link to appear above my signature. Is there any way to change that?

I feel like the link used to be above my signature, but I can't find a preference that seems to affect the location. I tried the 'signature appears above quoted text' checkbox which some people implied could change this, but no dice.