> You'd be hard pressed to find anyone who's at all component with the internet who thinks that this is true, nevermind a programmer.
On a related note, there are people without an email address who still use the web applications and smartphone apps that require accounts and/or notifications. In some (or most?) developing countries, people use phone numbers as the login identifier and may not have an email address (or not know that they have one and what to do with it).
>> Everyone has exactly one email address
> You'd be hard pressed to find anyone who's at all component with the internet who thinks that this is true, nevermind a programmer.
On a related note, there are people without an email address who still use the web applications and smartphone apps that require accounts and/or notifications. In some (or most?) developing countries, people use phone numbers as the login identifier and may not have an email address (or not know that they have one and what to do with it).