Render unique content for each email.
Render unique content for each email.

This is to ensure performance doesn't suffer too much due to GH-2486.

I also made these pseudo-private since they're probably going to be
changed in the future and nobody should be using them anyway.

mitsuhiko/sentry,ifduyue/sentry,jean/sentry,jean/sentry,JamesMura/sentry,JamesMura/sentry,fotinakis/sentry,ifduyue/sentry,beeftornado/sentry,BuildingLink/sentry,looker/sentry,alexm92/sentry,beeftornado/sentry,zenefits/sentry,JamesMura/sentry,BuildingLink/sentry,mvaled/sentry,jean/sentry,gencer/sentry,zenefits/sentry,ifduyue/sentry,fotinakis/sentry,alexm92/sentry,fotinakis/sentry,gencer/sentry,gencer/sentry,looker/sentry,looker/sentry,gencer/sentry,fotinakis/sentry,ifduyue/sentry,mvaled/sentry,JamesMura/sentry,jean/sentry,BuildingLink/sentry,alexm92/sentry,JackDanger/sentry,JackDanger/sentry,ifduyue/sentry,JackDanger/sentry,looker/sentry,zenefits/sentry,mitsuhiko/sentry,mvaled/sentry,zenefits/sentry,looker/sentry,BuildingLink/sentry,beeftornado/sentry,JamesMura/sentry,mvaled/sentry,zenefits/sentry,gencer/sentry,mvaled/sentry,mvaled/sentry,BuildingLink/sentry,jean/sentry