Extension to prevent From addresses that might lead to blacklisting

[JoeMurray]

We are working with a client who wants to ensure that their staff don't inadvertently cause the CiviCRM to be blacklisted. It has happened once already since the domain of the CiviCRM instance is not the same as the very large organization's email domain, which has very strict policies.

Here is the initial functional spec:
https://github.com/JoeMurray/biz.jmaconsulting.ode/blob/master/README.md

Any comments or feedback on this in terms of approach and scope?