How to access system files

How to see system files in Finder (e.g. the main mail data file) ?

Not sure what "system files" you mean, but you might find it when you have Finder opened and look in your Menu bar (which starts with the  logo).
Then you find "Go" to the right.
1. For the system files -> Click Computer in the list, then Macintosh HD (Or what ever your hard disk is named) and then there is a folder name "System".
You might also mean that you are trying to find the library, which is located there also.
2. If it is the library you are seeking, you might need the "User Library" which is hidden by default.
To get that, open the "Go" menu again and then press and hold the "Option(or alt)" on your keyboard.
Then "Library" will show up in the middle of the list, and that is your user library.
I hope I was a bit of help, please do note that these folders contain very important information.
I strongly advise you to only adjust anything in there, if you perfectly know what you are doing.
Cheers~

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