[sqwebmail] Attachment Problem

[doods]

Hello again.
I'm again sending my problem hoping that someone may now have an answer. I'm 
running qmail+vpopmail+Apache2 on a Solaris 8 box. Everything is going 
smoothly except when attaching binary files in sqwebmail. It seems that the 
attached file can't be viewed eventhough I click the 'preview' button. The 
sqwebmail also can't display the attachment if I send the attachment to 
myself. But if sent to another address, no problem. The attachment also has 
no problem when I retrieve my mail on an email client via pop3.
The problem is only when I use the sqwebmail interface.
I hope somebody can help me out.
Thanks in advance.