This is actually not a limitaton of Webmail/SquirrelMail, but of PHP.
You will need to add/edit "
OS X Server does not come with a
file in place (it relies on the default values compiled into PHP).
If you haven't done so already, just create a new
file and add:
upload_max_filesize = 5M
(or whatever size you need)
When done editing issue:
sudo /usr/sbin/apachectl graceful restart
Alternatively you can copy the supplied
and use it as starting point.
I do recommend to start with a new file though. Over time you can just add any parameters you want to differ from the defaults, while still keeping a clean and readable