Plone 4.0.4 and collective.contentrules.mailtogroup - no group search result

I would be very happy to have "mailtogroup" installed - really - so if someone could tell me how to exactly configure "mailtogroup" in order to sent group email. The problem is that no group names pop up, when I do the se开发者_运维知识库arch. I was able to setup the single user email facility.

The first thing I'd check if you have the right version of UberSelectionWidget installed. From the documentation for mailtogroup:

This content rule uses the UberMultiSelectionWidget from plone.app.form. This widget is broken in version 1.1.7 of plone.app.form. Plone 3.3.4 has this version.

As of version 1.1.8 the widget is working again. To use the correct version pin down plone.app.form:

[versions] ... plone.app.form = 1.1.8

Do you see any errors in the Plone log? You need to be precise when searching for users/groups. Can you try to search for the default 'administrators' group? Are you using the latest version (1.2) of mailtogroup?