I am using Sylpheed as my email client in Kubuntu 12.04
When I delete an unread email in the inbox, it gets placed in the Trash folder.
When I delete a read email in the inbox, it gets deleted without being placed in the Trash folder.
The manual says: "Trash: in here all your deleted messages go."
Is this a bug or have I just not been able to find the setting?
On top of the message field in Trash view, there is a select button right next to the 'Search' field, with the options All, Unread, Have color label etc
These are filters for Trash view and need to be set to All to be able to see all deleted folder. Somehow, I had Unread set. Changed it to All solved it.