Does the email Subject mention the Double or Triple Miles? If not, what is the Subject?

I regularly delete lots of RN emails, as long as the subject seems very general (you can earn miles outdoors, you can earn miles on vacation this summer, etc) and does not hint at containing a bonus. (Actually, I tend to open one email of each type from one airline usually, then assume any by the same Subject from another airline are the same in terms of not being about any bonus.)