There seems to be an issue with multiple delete.
If i have a message preview visible and i select multiple messages above, there is no way to delete them all at once. the only trash can that is displayed is in the preview window which only deletes the currently visible message ignoring the fact that multiple messages are selected.
It does work however if the preview window is closed. I can then select multiple messages and a pop-out icon for a trashcan displays and they all disappear.
On the old interface i could click on one message, hold the shift key and then click the last message and everything in between is selected. Then i can delete them all. That functionality does not seem to exist on Runbox 7. I have to manually select multiple emails. For example if i receive 50 emails today and 20 of them are spam and they are grouped together before i could select them all and delete. Currently i have to click on one at a time to select them and then delete. A lot more clicking.
The old interface had the ability of clicking on a blank square on the header bar and it would either select all or deselect all (if some or all messages were already checked off). That functionality also seems to be missing.