How to use the sumo.email_utils.make_mail function in sumo

def _make_mail(locale, user):
        if revision.is_approved:
            subject = _(u'Your revision has been approved: {title}')
        else:
            subject = _(u'Your revision has been reviewed: {title}')
        subject = subject.format(title=document.title)

        mail = email_utils.make_mail(
            subject=subject,
            text_template='wiki/email/reviewed.ltxt',
            html_template='wiki/email/reviewed.html',
            context_vars=c,
            from_email=settings.TIDINGS_FROM_ADDRESS,
            to_email=user.email)

        msgs.append(mail)

def _make_mail(locale):
                        mail = email_utils.make_mail(
                            subject=subject,
                            text_template='users/email/already_activated.ltxt',
                            html_template='users/email/already_activated.html',
                            context_vars=email_kwargs,
                            from_email=settings.DEFAULT_FROM_EMAIL,
                            to_email=user.email)

                        return mail

def _make_mail(locale):
            mail = email_utils.make_mail(
                subject=subject,
                text_template=text_template,
                html_template=html_template,
                context_vars=email_kwargs,
                from_email=settings.DEFAULT_FROM_EMAIL,
                to_email=send_to)

            return mail

def _make_mail(locale):
        mail = email_utils.make_mail(
            subject=_('Welcome to SUMO!'),
            text_template='users/email/contributor.ltxt',
            html_template='users/email/contributor.html',
            context_vars={'username': request.user.username},
            from_email=settings.DEFAULT_FROM_EMAIL,
            to_email=request.user.email)

        return mail

def _make_mail(locale):
                mail = email_utils.make_mail(
                    subject=subject,
                    text_template=text_template,
                    html_template=html_template,
                    context_vars=c,
                    from_email=from_email,
                    to_email=user.email)

                return mail

def _make_mail(locale, user, context):
            subject = _(u'Solution found to Firefox Help question')

            mail = email_utils.make_mail(
                subject=subject,
                text_template='questions/email/solution.ltxt',
                html_template='questions/email/solution.html',
                context_vars=context,
                from_email=settings.TIDINGS_FROM_ADDRESS,
                to_email=user.email)

            return mail

def _make_mail(locale):
            subject = _('Please confirm your email address')
            context = {
                'activation_url': cls._activation_url(watch),
                'domain': Site.objects.get_current().domain,
                'watch_description': cls.description_of_watch(watch)}

            mail = email_utils.make_mail(
                subject=subject,
                text_template='questions/email/activate_watch.ltxt',
                html_template='questions/email/activate_watch.html',
                context_vars=context,
                from_email=settings.TIDINGS_FROM_ADDRESS,
                to_email=email)

            return mail

def _make_mail(locale, user):
        if revision.is_approved:
            subject = _(u'A revision you contributed to has '
                        'been approved: {title}')
        else:
            subject = _(u'A revision you contributed to has '
                        'been reviewed: {title}')
        subject = subject.format(title=document.title)

        mail = email_utils.make_mail(
            subject=subject,
            text_template=text_template,
            html_template=html_template,
            context_vars=c,
            from_email=settings.TIDINGS_FROM_ADDRESS,
            to_email=user.email)

        msgs.append(mail)