Sometimes I have to distribute information to a particular group of people out of my contacts, let's say all members of my study group or to all my relatives. Is there a short cut to do this without specify each of them out of my address book for each e-mail I'll send anew? I'm looking for a group management, which allows to use virtual group addresses, which kmail resolves into the single e-mail addresses before sending the mail. Is this possible with kontact / kmail / kaddressbook? Any hint is appreciated.

I found the solution in another, probably more frequented forum.
Once you fill in a second receiver into a new mail, there comes a button up, that says "Save this list". So when you filled in all the wanted addresses, you can save this list by a memorable name and use it instead for future use.

You can also create group of contacts directly in address book. Then use the group name as mail address or use the Select... button to choose a group (or single contact)