[Evolution] Removing the send email keyboard shortcut

[Andrew Beverley <andy andybev com>]

Hi guys,

Is there a way to disable the Ctrl-Enter keyboard shortcut in Evolution,
and/or change it to something else?

I've tried redefining it using these instructions, but that doesn't seem
to work, presumably because I'm not using Gnome2:

https://mail.gnome.org/archives/evolution-list/2009-March/msg00254.html

I'm using Ubuntu 14.04, but with Evolution version 3.12.2

Thanks,

Andy