Brief explanation: For a number of addresses @fedoraproject.org there were windows when those email addresses would have bounced reporting that the address did not exist. This happened as a result of the re-installation of the mail forwarding server. Please check all mailing list subscriptions to make sure you have not been inadvertently unsubscribed or disabled due to this error.
Gory Details: During it's re-installation the postfix mail server was installed but it was not configured in the alternatives system so that its /usr/bin/newaliases command was the one being run. As a result sendmail's newaliases command was being run and it was changing the permissions of the aliases file such that postfix could not read it. It did not get noticed until Tuesday due to other issues taking precedence. The alias-generation would run once every 30 minutes. Breaking the aliases. Then our configuration management system would run on a slightly out-of-pace schedule with the aliases and correct the permissions.
This problem has been corrected, sorry for the inconvenience.
-sv
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Seth Vidal