How can I see the emails address from marketing campaigns in Odoo?

I have sent some emailing campaigns form Marketing, at "Mass Mailings" at details I have "Emails" button. When I click on it I have columns "Mail ID (tech)", "Message-ID", "Sent" and others. But I do cannot see the email to which I have sent.

How can I see the email, which I think is the most important information, because I cannot see which client has opened the email?

Solution

@Ek Kosmos, You need to add some code to do so. Please apply following code to your repository.

addons/mass_mailing/models/mass_mailing_stats.py

 def _compute_recipient(self, cr, uid, ids, field_names, arg, context=None):
        res = dict.fromkeys(ids, '')
        for stat in self.browse(cr, uid, ids, context=context):
            if not self.pool.get(stat.model):
                continue
            target = self.pool[stat.model].browse(cr, uid, stat.res_id, context=context)
            email = ''
            for email_field in ('email', 'email_from'):
                if email_field in target and target[email_field]:
                    email = ' <%s>' % target[email_field]
                    break
            res[stat.id] = '%s%s' % (target.display_name, email)
        return res

in same file add into columns = {}

'recipient': fields.function(_compute_recipient, string='Recipient', type='char'),

then add into view

addons/mass_mailing/views/mass_mailing.xml

<field name="recipient"/>