RE: Hopefully Contact Form 7 can do something with an update that will bring us back to the way it was before.
This is not usually something that CF7 can do anything about. Contact Form 7 uses the standard recommended methods used to send emails in WordPress. If people are unable to send emails from the CF7 plugin, it is likely that they are unable to send emails from WordPress in general.
Importantly the sending and receiving of emails depends heavily on both the server where the WordPress installation is hosted and the email configuration of the local computer where the emails are supposed to be received. If people are having CF7 email problems, they will need to investigate this issue in detail for your particular local configurations.
Also despite any similarity in symptoms it is likely that the solutions required in many cases are completely different.