If a DOLS user sets their off-line mail file to "save sent mail" automatically, they may receive an error trying to save and send a mail which includes an attachment ("Cannot access documents original database to copy attachments. Click here to close this window and return to the main window"). The result of this error is that the mail will be sent to the recipients mail box during sync, but the message will not be saved in the "Sent" queue in the sender's off-line mail database.
Workaround: None.