Recently the moderator of a mailing list I host got a Mailman error. And this is what was in Mailman's error log: May 29 21:55:21 2015 admin(16001): @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ admin(16001): [----- Mailman Version: 2.1.16 -----] admin(16001): [----- Traceback ------] admin(16001): Traceback (most recent call last): admin(16001): File "/usr/lib/mailman/scripts/driver", line 117, in run_main admin(16001): main() admin(16001): File "/usr/lib/mailman/Mailman/Cgi/admindb.py", line 203, in main admin(16001): process_form(mlist, doc, cgidata) admin(16001): File "/usr/lib/mailman/Mailman/Cgi/admindb.py", line 785, in process_form admin(16001): if id not in senderactions[sender]['message_ids']: admin(16001): KeyError: 'message_ids' admin(16001): [----- Python Information -----] admin(16001): sys.version = 2.4.3 (#1, Jan 9 2013, 06:47:03) [GCC 4.1.2 20080704 (Red Hat 4.1.2-54)] admin(16001): sys.executable = /usr/bin/python admin(16001): sys.prefix = /usr admin(16001): sys.exec_prefix = /usr admin(16001): sys.path = ['/usr/lib/mailman/pythonlib', '/usr/lib/mailman', '/usr/lib/mailman/scripts', '/usr/lib/mailman', '/usr/lib64/python24.zip', '/usr/lib64/python2.4/', '/usr/lib64/python2.4/plat-linux2', '/usr/lib64/python2.4/lib-tk', '/usr/lib64/python2.4/lib-dynload', '/usr/lib/python2.4/site-packages'] admin(16001): sys.platform = linux2 admin(16001): [----- Environment Variables -----] admin(16001): HTTP_COOKIE: wendell-townsfolk+moderator=28020000006976186955732800000037663266333937633233343834636466636163626230326138666637653834613966616561613230 This is on a CentOS 5.11 system (64bit), with Mailman 2.1.16 that I built as an RPM from the sources. Is this something I need to worry about? Or is it likely to have been caused by an illformed spam message? -- Robert Heller -- 978-544-6933 Deepwoods Software -- Custom Software Services http://www.deepsoft.com/ -- Linux Administration Services heller@deepsoft.com -- Webhosting Services