I have portfolio and course sites on QA3-US and QA29-longsight. Both servers behave the same regarding emails.
Emails are sent for announcements, assignments, etc, in portfolio or course sites, as long as they are for non-ePort tools. Emails are NOT sent in either a course or portfolio site if the tool to send is an ePort tool, (matrix, portfolio, etc).
Create a course site and a portfolio site
Add non-ePort tools to both sites that can send emails (assignments, announcements, etc)
Add ePort tools to both sites (matrices, portfolios, etc)
Add an assignment to both sites
Add a matrix to both sites which allows the participant to request reviews
As the student:
Submit the assignment in both sites - you will receive an email confirmation
Add a reflection in the matrix for both sites and request feedback - choose another student for the review
No email is received by the student or the default reviewer