Mash-out at 168°F is above pasteurization temperature.Invalid Stout wrote:If I were going to do a no-boil ale I'd definitely at least bring the mash up to pasteurisation temperature at some point. You know how bad spent grain stinks after a few days. Leave all those organisms on the grain alive and the ale will taste foul and probably grow a layer of fur on top.
HTST pasteurization temperature is 72°C = 162°F, for at least 16 seconds. If you hold mash-out temperature for 30 seconds you should be completely safe.