Hi Ashley,
We are waiting for some other work to be completed and a release cycle to go through to live. I will check with team if we can push that through next week.
There aren't any changes to how you setup a domain.
So the usual method is:
Setup a domain using Outbound Routing Mode "DNS" connection. For example "yourcompanyemaildomain.co.uk"
Then in the report schedule you can use any appropriate email in that DNS (as long as your DNS allows it). It is up to you/your internal IT to setup the actual email addresses you want to use within your domain. So maybe you setup a couple of email address for different report types... "asset.reporting@yourcompanyemaildomain.co.uk" , "sd.reporting@yourcompanyemaildomain.co.uk" etc... You can then just use which ever as the "From" address you want for your report.
An alternative, not really recommended, is you setup email domain routing with SMPT. So for example i setup a "gmail.com" domain as SMPT using my personal address.
Cheers