The "Access Denied" part of the problem has been reported upstream: https://secure.phabricator.com/T6790
I am getting emails from Diffusion about old changes, but clicking a link there gives a Access Denied message:
Access Denied: Restricted Application
You do not have permission to view this object.
Users with the "Can View" capability:
Administrators can take this action.
example link: https://phabricator.wikimedia.org/rECAUdce6468d5859 for gerrit I1c01d2c772f43542b91df374b7408b861b68cfc6
Is there a way to avoid such emails, because I cannot read the destination and it is a old patch set already merged?