Thanks for the reply
Well, when trying to attach a file lets say example a .ogg file of about 50MB or so, or perhaps a .zip file, and I tried it on down to about 9MB or under and 9MB seems ok to send, but no more then that.
Also combinations of several image files that total 9MB or so gives me the same results
I get this popup window regarding compose.php etc. see screenshot below
www.iclbiz.com/screen/1a.png
See the attachment section shows I can attach a max file size of 268,435,456 bytes which should be good
See my other screen shot of this section below

I thought I had this figured out and was actually sending large files from work without problem, but now I'm on the local network and noticed this problem when trying to send images to UPS for showing damaged package item for a damage claim.
I don't work at that place anymore so I've not tried to send anything using webmail from outside of the local network for over a year now, but never had any reason to think that I could not send large mail up until now.
that is one of the things I really need the webmail to do is send large file. not necessarily 256MB but I think that is just a side effect of my setting for joomla requirements for my daily video section etc. But in anycase basically this is my symptom and I cannot send large files or an accumulation of files larger then around 9MB I'm not sure the actual file size limit but approx. 9MB is what I believe.
I also get a fetch mail size limit
see here:

Any help would be great.
Thanks for your responses.