[horde] attachment problem

[Paras pradhan]

Hi,

I am using horde 2.13 in Redhat Linux 5.5 . It uses postfix to deliver
the messages to the relay host.

The IMP has

$conf['compose']['attach_size_limit'] = 26214400;

and postfix has 20M (message_size_limit = 20480000)

When I send mails of around 7 MB attachment, it goes through. But I
get a blank compose page after I attach and send mail with around 12MB
of attachment.

php.ini has all entires which handles upload size upto 20M

Any help is appreciated !

Thanks
Paras.