Comment 1 for bug 862675

The committed fix will fix this bug for systems in which the mailman installation is all on a single server.

For installations with multiple servers accessing Mailman via a shared file system, there can still be manifestations of this bug if there is time skew across the servers.

A complete fix would add another Defaults.py/mm_cfg.py setting such as

# Maximum time skew in seconds between servers in a shared file system environment.
# Set to 0 if the Mailman file system is on a single server.
SERVER_MAX_TIME_SKEW = 0

and changing line 611 of Mailman/MailList.py from

            if mtime < self.__timestamp:

to

            if mtime + mm_cfg.SERVER_MAX_TIME_SKEW < self.__timestamp: