Temporary and if it needs an answer, answer only makes sense if near immediate: use IM (slack etc...) Just an FYI that everybody needs to know or needs an answ

Temporary and if it needs an answer, answer only makes sense if near immediate: use IM (slack etc...) Just an FYI that everybody needs to know or needs an answer regardless of when you can answer: use email Information that is valid until a major change (or forever if that exists): document in your wiki or whatever documentation system you use. When I'm back from time off, I mark all slack channels as read.