Hi, My first post to this list, so apologies in advance if this has already been discussed. I`ve been experimenting with some of the sample code from Abe Fetting’s (very good) Twisted book and I`m a little stuck with one IMAP authentication method. The code is: from twisted.protocols import imap4 from twisted.internet import protocol, defer class IMAPFolderListProtocol(imap4.IMAP4Client):     def serverGreeting(self, capabilities):         self.registerAuthenticator(             imap4.CramMD5ClientAuthenticator(self.factory.username))         self.registerAuthenticator(             imap4.LOGINAuthenticator(self.factory.username))         authenticating = self.authenticate(self.factory.password)         authenticating.addCallback(self.__loggedIn)         authenticating.chainDeferred(self.factory.deferred)     def __loggedIn(self, results):         return self.list("", "*").addCallback(self.__gotMailboxList)     def __gotMailboxList(self, list):         return [boxInfo[2] for boxInfo in list]     def connectionLost(self, reason):         if not self.factory.deferred.called:             # connection was lost unexpectedly!             self.factory.deferred.errback(reason) class IMAPFolderListFactory(protocol.ClientFactory):     protocol = IMAPFolderListProtocol         def __init__(self, username, password):         self.username = username         self.password = password         self.deferred = defer.Deferred()             def clientConnectionFailed(self, connection, reason):         self.deferred.errback(reason) if __name__ == "__main__":     from twisted.internet import reactor     import sys, getpass         def printMailboxList(list):         list.sort()         for box in list:             print box         reactor.stop()     def handleError(error):         print >> sys.stderr, "Error:", error.getErrorMessage()         reactor.stop()     if not len(sys.argv) == 3:         print "Usage: %s server login" % sys.argv[0]         sys.exit(1)             server = sys.argv[1]     user = sys.argv[2]     password = getpass.getpass("Password: ")     factory = IMAPFolderListFactory(user, password)     factory.deferred.addCallback(         printMailboxList).addErrback(         handleError)     reactor.connectTCP(server, 143, factory)     reactor.run() However, when I try to connect to my IMAP4 server using this code, I get: Error: No supported authentication schemes available: Server supports ['PLAIN'], client supports ['CRAM-MD5', 'LOGIN'] I can`t seem to find a suitable PLAIN method in IMAP4client, so before I re-invent the wheel, is there a standard Twisted way to handle this situation (or am I simply missing something obvious)? Thanks, David