Line length when writing an email

[Sharon Kimble]

I've recently found that when writing an email the line length is not
recognised, in spite of having
--8<---------------cut here---------------start------------->8---
(setq-default fill-column 78)
--8<---------------cut here---------------end--------------->8---
in my '.gnus.el'. When replying to an email the line length very often goes to
the edge of the window, even with 'Word Wrap (visual line mode)' enabled.

How can I get it to just stop at a line length of just 78 characters please?

Thanks
Sharon.
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