from archetypes import entities
from archetypes.services import sqlservice

def remove_from_chain_notifications(email):
    with sqlservice() as db:
        notif = db.fetch_one(entities.Fact, key='chain_notifications')

        for n in notif.value['email_details']:
            print n['email_types']
            for t in n['to']:
                if t == email:
                    print "Removing: {}".format(t)
                    n['to'].remove(t)

    with sqlservice() as db:
        notif2 = db.save_fact(notif)

remove_from_chain_notifications('exampl@gmail.com')