With recent Mailman, the "<" is sent back to the browser as "<", but the browser should render that as "<".
If you enter "<", that is what is stored in the list attribute. It is only converted to "<" in the HTML sent back to the browser. Now if the browser is broken and displays the "<" as "<" and not as "<", and you "Submit Your Changes" a second time with "<" in the text box, that could store the wrong data.
What Mailman version is this? What browser?
With recent Mailman, the "<" is sent back to the browser as "<", but the browser should render that as "<".
If you enter "<", that is what is stored in the list attribute. It is only converted to "<" in the HTML sent back to the browser. Now if the browser is broken and displays the "<" as "<" and not as "<", and you "Submit Your Changes" a second time with "<" in the text box, that could store the wrong data.