Add documentation on ``mail.list-namespace``.
Add documentation on ``mail.list-namespace``.

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