Exception Error: not authorized to call MailApp.sendEmail

[Simon Parfait]

Here is the code.

I want to send an email when a specific column is modified in my Google Sheet (when delivery dates are modified) however I keep receiving this error (code 72 : 13) and can't seem to find a solution. 
I tried the links it gave me but it's a literal maze for me lol.

[George Ghanem]

The issue is the fact that you are using the onEdit simple trigger. Simple triggers can only be used to modify the spreadsheet itself and not use any external services such as sending an email. You can change this to an installed trigger by changing the name of the function, defining the trigger manually and doing the required authorization approval. But note that any user of the spreadsheet will also need to do the authorization for the trigger to work for them.

Hope this helps.

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[Alex]

George is right

Look at the Restrictions section https://developers.google.com/apps-script/guides/triggers#restrictions

[Simon Parfait]

Okay thank you very much!