Out of the blue my mailman mailing lists started producing these errors after someone would post a message...
----- Transcript of session follows -----
Traceback (innermost last):
File "/var/mailman/scripts/post", line 33, in ?
from Mailman import MailList
File "/var/mailman/Mailman/MailList.py", line 41, in ?
from Mailman.ListAdmin import ListAdmin
File "/var/mailman/Mailman/ListAdmin.py", line 37, in ?
from Mailman.Handlers import HandlerAPI
File "/var/mailman/Mailman/Handlers/HandlerAPI.py", line 26, in ?
from Mailman.pythonlib.StringIO import StringIO
ImportError: cannot import name StringIO
554 5.3.0 unknown mailer error 1
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