Everything works fine, except I've just realised that "WP Mail From" has broken "Contact Form 7" in that in "Contact Form 7" it is changing the From: field to that set by WP Mail From.
But, I should probably add a caveat here in that WP Mail From is doing exactly as it should do, and that it is most likely "Contact Form 7" that may require to be changed. I suspect "WP Mail From" is using a priority of 1, and that all that needs to be done to fix it is that "Contact Form 7" should use a higher priority.
But, how do I convince the "Contact Form 7" plugin developer to change his plugin to use the priority system?
Will he argue that his plugin is not doing what it should be doing in the first place?
That's the only reason I have left a comment here, as I need help in convincing the Contact Form 7 developer to change his plugin.