Here you can select what should happen with old messages in this folder. If you enable Expire old messages in this folder then & kmail; will regularly, depending on your choice, either delete old messages or move old messages to another folder. You can also start expiration of old messages manually via Folder Expire and via File Expire All Folders
Aquí pode seleccionar o que queire que lles aconteca ás mensaxes vellas deste cartafol. Se activa Expirar as mensaxes vellas deste cartafol