it is possible, but it's also true that telegram bot is the only platform of Navalny smart vote service that keeps working(aside text file circulating all over the internet)
1. Spare emails, like, lots of them
2. Users of mail.ru and such are their own worst enemy, and it's not like getting gmail address is particularly difficult
Last time I checked I couldn't create a new gmail account without a new phone number.
Anyway, emails these days are nearly instantaneous too, not that much slower than, say, WhatsApp
it's sad, but it's like this.