remove restriction on line length in mutt compose

[Globe Trotter via Mutt-users]

Hi,

I appear to have hit some key while using compose in mutt, and the result is 
that I end on a new line after a certain length of characters in a new line. 
What controls this? It is not a vi issue because the editor does no wrap after 
even a very long, as used to be the case until earlier today.

Thanks in advance!