Hi, i´m also new to the forum. Last week i installed the Community Eddition 11.0.2 on a fresh ubuntu 6.06 TLS server installation. Everything went fine (thanks for the very good installation guide on debian/ubuntu!

), except for the same problem mentioned above.
The first user created during the installation can send mails to the second created user (only internal mail configured) and the mail will be delivered nicely. When the second tries to answer (or send a new mail), the message will not be be delivered, but show in the drafts folder.
Neither the first nor the second user is member of a Scalix-Admin-Group nor member in the scalix-group in /etc/group.