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https://store.steampowered.com/account/emailoptout
Client settings, Steam > Settings > Notifications
That's under the client settings. You can turn on/off toasts for that one, under "There's a major sale."
I have had varying results for about 2 years now. I've been complaining about emails being sent out at different times during the day/night for the same event and also emails being sent out at 3AM.
https://steamcommunity.com/discussions/forum/10/3826424998954802769/
https://steamcommunity.com/discussions/forum/10/3801650156483587776/
Maybe they are doing them in batches to not overload their servers but after a certain time the batches should stop till 8am the next day.