I am trying to tune/implement max conversation attachment upload file size for Plone 4.1 and Ploneboard.
The code processing the uploads seems to be this in PloneBoard:
    # Create files in message
    if files:
        for file in files:
            # Get raw filedata, not persistent object with reference to tempstorage
            # file.data might in fact be OFS.Image.Pdata - str will piece it all together
            attachment = File(file.getId(), file.title_or_id(), str(file.data), file.getContentType())
            m.addAttachment(attachment)
Where and how uploaded filesizes are adjusted in Plone, Zope and Ploneboard?
 
                        
Looks like this one was controlled in PloneBoard forum Edit page settings directly.