semd mail mass end track_email

email_track.py

# save message to DB
email_track = Message(
    body=message_body,
    sender=request.user,
    recipient=cand.candidate,
    job=obj,
    uuid=uuid.uuid4()
)

_url = '{}{}?uuid={}'.format(settings.CAREER_PAGE_DOMAIN, reverse(
    'track_message_email'), str(email_track.uuid))
image_track = '<img src="' + _url + '">'

context = {
        "candidate_name": firstname,
        "candidate_email": email,
        "message": message_body,
        "image" : image_track
}

message_to_candidate.append(email_track)
html_content = render_to_string('emails/message-to-candidates.html', context=context, request=request)
data_context[cand.pk] = {
    'html_message' : html_content,
    'to_mail_list' : [cand.candidate.email]

}
send_mass_candidate_email(msg_title, candidates, data_context)

message-to-candidates.html

{% load i18n %}
<table style="width:600px;">
    <tr>
        <td align="left" style="padding:5px 20px 20px 20px;border-bottom:1px #ccc solid;">
            <p><font color="#333333" face="Arial" size="2">{% trans "Olá" %} {{ candidate_name }},</font></p>
            <p><font color="#333333" face="Arial" size="2">
                {{ message|safe }}
            </font></p>
        </td>
    </tr>
    <tr>
        <td align="left" style="padding:5px 0 0 20px;">
            <font color="#333333" face="Arial" size="1"><i>*{% trans "Esta é uma mensagem automática. Não responda por favor" %}.</i></font>
        </td>
    </tr>
</table>
{{ image|safe }}

send_mass_candidate_email.py

def send_mass_candidate_email(subject, candidates, data):
    '''
    envidando email em massa para candidato

    subject: string
    candidates: Candidate queryset
    data: dict
        key: candidate pk
        html_message: rendered message
        to_mail_list: list string email
        attach_list: list file object

    estrutura do dict data
    data = {'cand_pk' : {
            'html_message': 'hmtl_renderizado' ,
            'to_mail_list' : ['email_1', 'email_2', 'email_3']
            'attach_list' : [object, object, object]
        }
    }
    '''

    # open email connection
    connection = get_connection()
    connection.open()
    for cand in candidates:
        cand_data = data[cand.pk]
        html_content = cand_data['html_message']
        to_email = cand_data['to_mail_list']
        attach_list =  cand_data.get('attach_list',[])
        msg = EmailMultiAlternatives(
            subject,
            html_content,
            settings.SERVER_EMAIL,
            to_email,
            connection=connection
        )

        for attach in attach_list:
            msg.attach(attach.name, attach.read())

        msg.attach_alternative(html_content, "text/html")
        msg.send()
    connection.close()  # Cleanup

track_message_email.py

def track_message_email(request):
    from StringIO import StringIO
    import urllib
    from PIL import Image

    uuid = request.GET.get('uuid')
    message_track = get_object_or_404(Message, uuid=uuid)

    message_track.is_readed = True
    message_track.read_at = timezone.now()
    message_track.save()

    image_path = 'https://s3.amazonaws.com/jobquiz/combo/images/image_trck.gif'
    image = Image.open(StringIO(urllib.urlopen(image_path).read()))
    return redirect(image_path)