[Users] How to add a list of addresses as recipients?

[kardan]

Dear List,

maybe this is again an easy question. My aim is to add a bunch
of recipients to my mail, but I end up with one line containing all the
addresses separatedly with "\n" in between. I thought claws is clever
and splits them, but the log states 'Bad recipient address syntax'.
The first what comes to my mind, is to add them all to the adressbook
and create a group. What is the proper fix?

Thanks,
Kardan