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I had no problem for a long time and no changes have been made (extensions, ...).
I figured out that I have this problem when I mark my text for "background color"
I can do everything else: bold, change color of text, ... but when I want to change background color of text (which is sometimes very important) I get this error.
Why have this started?
This is to do with mod_security falsely triggering. Please see → https://sendy.co/troubleshooting#403-forbidden-error-when-clicking-save-and-next