The CRM has been updated to allow for emails to be sent from a user's own domain rather than firstname.lastname@example.org.
To configure this, an Administrator will need to register their domain via https://admin.prospect365.com/Setup/Domains.aspx.
The domain's SPF record will also need updating to include the below. You will most likely need to contact your domain provider to get this added.
For example, if the existing record is
v=spf1 a:smtp.myispname.net -all, then you will need to adjust it to this:
v=spf1 a:smtp.myispname.net include:sendgrid.net -all
Going forward all emails sent by the user will be from their own email domain.