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When clicking on a link from an email to a private message post you get a "Post Not Found" error page if not logged in.
My suggestion is to show a login page and the redirect to the post after login.
We see this error and have logged as a bug. Not sure if we will retain the link and correct it or simply disable it.
This message is a convenience to the user that they got a PM, but not sure we need the link back into the post.
Thanks for reporting.
communityops
I think it should be kept and corrected.