Following from John’s other thread we are keen to do this as we know how much better this would be for you.
Would everyone wanting this be comfortable with adding two DNS records to their domain to enable this functionality? This would make it much easier for us to implement and ensure reliable email delivery. This is something that can be done in your email domain’s DNS settings (which is typically the domain registry that you have used). One would be a DKIM TXT record, and the other would be a Return-Path CNAME record. Most DNS providers make this functionality easy. Breww would explain in the setup process what exactly needs to be added and be able to verify if it has been done correctly.
If this is something that people looking for this feature would be able to implement, this should really help us on the implementation side.