i found a way to display the whole mailbox with
But one thing i still not understand:
zmmailbox -z -m email@example.com modifyfoldergrant / account firstname.lastname@example.org rwidx
zmmailbox -z -m email@example.com createmountpoint --view message "/mail/" firstname.lastname@example.org /
When i send a email from this folder, it use the sender from the logged person an not from the shared mailbox (From: address).
is there a option, that the mail use the sender from the shared mailbox and put the mail also in the right "Send" folder?