I've installed Mailmanager on Zope 2.9.3 as described in the README.txt file of Mailmanager :
I've moved BTreeFolder2, CookieCrumbler, Epoz, FileSystemSite, stripogram, PlacelessTranslationService, ZopeScheduler and TimerService in my instance Zope Products folder.
I've installed mxDateTime with the egenix-mx-base-2.0.6.win32-py2.4.exe autoinstaller.
But Mailmanager doesn't appear in the drop-down add menu list of the ZMI and in the Products list.
No error message.