[imp] Can't attach file size more than 500KB

[Bundit Chucheep]

Hi,

I've setup Horde 2.2.1/Imp 3.2 on Redhat 8.0.
Every thing is working but when I compose mail and try to=20
attach file that have size more than 500KB.
I'll get an error page:

"The page cannot be displayed
...
Cannot find server or DNS Error
Internat Explorer"

But, if file size lessthan 500KB. It's can send mail normally.

In php.ini I've set upload_max_filesize =3D 2M, unless is default.

Please help me to solve this problem.

Regards
Bundit