No useful feedback.

If it is that critical to you, consider hiring someone to fix it for 
you: http://horde.org/consulting/. Otherwise, please calm down and 
stop shouting.

I add the user test with password test in webmail.definet.fi if you 
wan't to test the attachments.

IT MUST TO WORK, PLEASE HELP....

My linux version is Fedora 3 ( horde 3 was mistype )

I have no sense with the Horde either, IMP and HORDE configuration in OK.

Those attachments cause problem. When I turn the attachment to link 
files all goes right, but when I'm trying to send mail with 
attachments included in the mail, the attachments will cause the mail 
unreadable in IMP or can't open at all. Mail can be read with other 
mail application, but the attachments are maybe partly or totally 
messed up.

I'm using the Horde VFS system for storing uploaded attachments, but 
if it's turned off or not attachments acts same way. So if I don't 
send attachments at all, the IMP will work fine.

Sendmail version is 8.13.1-2

http://webmail.definet.fi/horde/test.php

You're not making any sense, and your summary doesn't help either. 
Please provide more detail and suggest a more useful summary for the 
ticket.

mail sended by Horde with attachment(s), may be totally unreadable or 
have all missing attachments in it or will mixing part's of 
attachments to one unreadable attachment.

PHP/4.3.11

Apache/2.0.52

Horde 3