The IceWarp ver 11 interface has been redesigned, an improved mail interface based on users feedback.
The first important thing to take note of is that at right under the photo icon you can right click for a menu and switch back to the old interface (ver 10.4.5) as well as access your usual Options panel.
Secondly when logging in please make sure that in your username and password there are no preceding spaces before or after and that passwords are capitalization case specific.
Inbox Management: Right click on any email for a context menu including "Manage Sender" where you can further white or black list the sender's email address.
Click on the Interface Image at right to go to the webmail interface which will open in a new browser tab.
Interface Direct Link - Variations on the webmail interface available for computer, tablet computer or mobile device. There are also links to more choices on the login screen.