can not see sent mail content that has an attachment

[niot]

I can send and receive mail with attachments without problems.
If I go to the sent folder and look at sent  email with attachment,
then the email blank, either text or attachment in sight.
(but not all sended mail whit attachement blank):confused:

I can see the contents of the sent email, if I connect with any other mail client (ex Outlook)

any suggestions what it could be ..:confused:

info:
Mailserver= Hmailserver (on windows 2003)
roundcube = lastest 0.5.3 (and test wiht 0.1)