Standard Notes should confirm email change
The standard practice for changing emails is to send a confirmation link before changing to ensure access and ownership of the new email. Currently, it let's you change it and sends out a notification email to your current (prior to changing) email address that it has already been changed with the new email address in the body.
The process should be:
1. Change email in account settings
2. System sends emails – 1: confirmation link to new address, 2?: current email notifying of change request
3. Click verification link in email sent to the new email address
4. System changes email
5. Confirmation email to new email address. And old address?
The "?"s in there might be overkill.
StandardNotes support article link: https://standardnotes.com/help/7/how-can-i-change-my-account-email

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AnotehrUsre commented
Note: I did this with a proton alias, so maybe it's just smart about proton aliases?