Outside India the quality of bank alerting varies enormously. US banks are the best in the world at this — Chase, Bank of America, Wells Fargo, Citi, Capital One, and Amex all offer granular, free, self-serve alerts with email as a first-class delivery channel. Canadian banks are close behind. Singapore and the UAE are strong, and in DBS's case email alerts are mandatory for some transaction types rather than optional.
The UK and Australia are weaker. Several major banks there document their alerting as text and app push, with email as an afterthought or absent entirely. And the app-first banks — Monzo, Starling, Revolut — have no per-transaction email at all. That is a deliberate product decision, not a setting you have failed to find.
This guide is organised by region and is explicit about which category each provider falls into, so you do not spend twenty minutes hunting for a menu that was never built. Where email alerts do not exist, it says what to use instead.