IMAP: Fehler beim Senden digital signierter Mails

Ich habe in OE 6.0 ein IMAP-Konto für mein WEB.DE-Postfach eingerichtet. Dabei habe ich folgendes Problem:

Gesendete digital signierte Mails können (im Gegensatz zu \“normalen\“ Mails) nicht in den Ordner \“Gesendet\“ verschoben werden. Ich erhalte stets die Fehlermeldung \“could not insert to database: -1\“

Protokoll:

Microsoft Internet Messaging API 6.00.2800.1106 (xpsp1.020828-1920)
IMAP Log started at 02/28/2004 20:10:52
IMAP: 20:10:54 [db] Die Verbindung mit \“imap.web.de\“ an Port 993 wird hergestellt.
IMAP: 20:10:54 [db] OnNotify: asOld = 0, asNew = 4, ae = 0
IMAP: 20:10:54 [db] Sichere Verbindung mit \“Microsoft Unified Security Protocol Provider\“ herstellen.
IMAP: 20:10:54 [db] OnNotify: asOld = 4, asNew = 6, ae = 2
IMAP: 20:10:54 [db] OnNotify: asOld = 6, asNew = 6, ae = 4
IMAP: 20:10:54 [db] OnNotify: asOld = 6, asNew = 5, ae = 2
IMAP: 20:10:54 [db] OnNotify: asOld = 5, asNew = 5, ae = 3
IMAP: 20:10:54 [rx] * OK WEB.DE IMAP4-Server
IMAP: 20:10:54 [tx] 007C CAPABILITY
IMAP: 20:10:54 [db] OnNotify: asOld = 5, asNew = 5, ae = 3
IMAP: 20:10:54 [rx] * CAPABILITY IMAP4 IMAP4rev1 LITERAL+ UIDPLUS X-NETSCAPE
IMAP: 20:10:54 [rx] 007C OK CAPABILITY Completed
IMAP: 20:10:54 [tx] LOGIN command sent
IMAP: 20:10:54 [db] OnNotify: asOld = 5, asNew = 5, ae = 3
IMAP: 20:10:54 [rx] 007D OK LOGIN Completed: User logged in
IMAP: 20:10:54 [tx] 007E APPEND \“Gesendet\“ (\\Seen) \“28-Feb-2004 20:10:51 +0100\“ {13960}
IMAP: 20:10:54 [db] OnNotify: asOld = 5, asNew = 5, ae = 3
IMAP: 20:10:54 [rx] + go ahead
IMAP: 20:10:54 [tx] Stream of length 13960
IMAP: 20:10:55 [db] OnNotify: asOld = 5, asNew = 5, ae = 4
IMAP: 20:10:55 [tx]
IMAP: 20:11:00 [db] OnNotify: asOld = 5, asNew = 5, ae = 3
IMAP: 20:11:00 [rx] 007E NO could not insert to database: -1
IMAP: 20:11:00 [tx] Dropping connection, LOGOUT sent
IMAP: 20:11:00 [db] Die Verbindung mit \“imap.web.de\“ wurde beendet.
IMAP: 20:11:00 [db] OnNotify: asOld = 5, asNew = 0, ae = 5

Liegt der Fehler bei OE oder beim IMAP-Server von WEB.DE?