Can't read var mail main

It seems like you're trying to read a variable named mail in a main function, but you're having trouble. Can you please provide more context or code so I can better understand what you're trying to do?

Here are a few possibilities:

1. Variable scope: Make sure that the mail variable is declared within the scope of the main function. If it's declared outside the main function, you might need to pass it as an argument or use a global variable.
2. Data type: Check the data type of the mail variable. If it's a complex data type like an object or an array, you might need to use a specific method to access its contents.
3. Initialization: Ensure that the mail variable is initialized before trying to read its value. If it's not initialized, it might be null or have a default value that's not what you expect.

If you provide more code or context, I'd be happy to help you troubleshoot the issue!