The February archive indexes of this list haven't been updating since Feb 8. The text file at <http://dovecot.org/pipermail/dovecot/2013-February.txt> appears to be up to date with all posts, but the index pages at <http://dovecot.org/pipermail/dovecot/2013-February/thread.html>, <http://dovecot.org/pipermail/dovecot/2013-February/subject.html>, <http://dovecot.org/pipermail/dovecot/2013-February/author.html> and <http://dovecot.org/pipermail/dovecot/2013-February/date.html> have no posts after the one at <http://dovecot.org/pipermail/dovecot/2013-February/071213.html> from Fri Feb 8 16:31:49 EET 2013.
Subsequent posts appear to not have individual HTML pages either as URLs <http://dovecot.org/pipermail/dovecot/2013-February/071214.html> and <http://dovecot.org/pipermail/dovecot/2013-February/071215.html> return 404 errors.
I suspect there is a permissions issue starting soon after Fri Feb 8 16:31:49 EET 2013 and that Mailman's error log has lots of tracebacks from this. If that is the case, the messages were probably all shunted and running Mailman's bin/unshunt after fixing the underlying issue and also making sure that any messages older than Fri Feb 8 16:31:49 EET 2013 in Mailman's 'shunt' queue that should not also be reprocessed are removed.
-- Mark Sapiro <mark@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan