In the context of email templates or for related features
like marketing campaigns or automated business document
notification, this flag may be used to disable the sending
of template-based emails to the partner.
It will not prevent sending an email based on a template
by default, each feature using a template should implement
this if needed.
bzr revid: odo@openerp.com-20111005113846-qik6d5gxd4xqeqdj
Olivier Dony