diff --git a/addons/event/models/event_mail.py b/addons/event/models/event_mail.py
index f9c99b8a0fe..d267ea68dd4 100644
--- a/addons/event/models/event_mail.py
+++ b/addons/event/models/event_mail.py
@@ -185,9 +185,10 @@ class EventMailScheduler(models.Model):
                 # do not send emails if the mailing was scheduled before the event but the event is over
                 if scheduler.scheduled_date <= now and (scheduler.interval_type != 'before_event' or scheduler.event_id.date_end > now):
                     scheduler.event_id.mail_attendees(scheduler.template_ref.id)
+                    # Mail is sent to all attendees (unconfirmed as well), so count all attendees
                     scheduler.update({
                         'mail_done': True,
-                        'mail_count_done': scheduler.event_id.seats_reserved + scheduler.event_id.seats_used,
+                        'mail_count_done': len(scheduler.event_id.registration_ids.filtered(lambda r: r.state != 'cancel'))
                     })
         return True
 
diff --git a/addons/event_sms/models/event_mail.py b/addons/event_sms/models/event_mail.py
index e00a66798c8..fc2cd10aa81 100644
--- a/addons/event_sms/models/event_mail.py
+++ b/addons/event_sms/models/event_mail.py
@@ -58,7 +58,7 @@ class EventMailScheduler(models.Model):
                     )
                     scheduler.update({
                         'mail_done': True,
-                        'mail_count_done': scheduler.event_id.seats_reserved + scheduler.event_id.seats_used,
+                        'mail_count_done': len(scheduler.event_id.registration_ids.filtered(lambda r: r.state != 'cancel'))
                     })
 
         return super(EventMailScheduler, self).execute()
diff --git a/addons/test_event_full/tests/test_event_mail.py b/addons/test_event_full/tests/test_event_mail.py
index 30c2766e804..9959bf539ff 100644
--- a/addons/test_event_full/tests/test_event_mail.py
+++ b/addons/test_event_full/tests/test_event_mail.py
@@ -1,6 +1,11 @@
 # -*- coding: utf-8 -*-
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
+from datetime import datetime, timedelta
+from freezegun import freeze_time
+
+from odoo.addons.mail.tests.common import MockEmail
+from odoo.addons.sms.tests.common import MockSMS
 from odoo.addons.test_event_full.tests.common import TestWEventCommon
 from odoo.exceptions import ValidationError
 from odoo.tests import tagged
@@ -43,3 +48,80 @@ class TestTemplateRefModel(TestWEventCommon):
                         self.assertEqual(str(cm.exception), 'The template which is referenced should be coming from mail.template model.')
                     else:
                         self.assertEqual(str(cm.exception), 'The template which is referenced should be coming from sms.template model.')
+
+class TestEventSmsMailSchedule(TestWEventCommon, MockEmail, MockSMS):
+
+    @freeze_time('2020-07-06 12:00:00')
+    def test_event_mail_before_trigger_sent_count(self):
+        """ Emails are sent to both confirmed and unconfirmed attendees.
+        This test checks that the count of sent emails includes the emails sent to unconfirmed ones
+
+        Time in the test is frozen to simulate the following state:
+
+                   NOW     Event Start    Event End
+                  12:00       13:00        14:00
+                    |           |            |
+            ──────────────────────────────────────►
+            |                   |                time
+            ◄─────────────────►
+                  3 hours
+              Trigger before event
+        """
+        self.sms_template_rem = self.env['sms.template'].create({
+            'name': 'Test reminder',
+            'model_id': self.env.ref('event.model_event_registration').id,
+            'body': '{{ object.event_id.organizer_id.name }} reminder',
+            'lang': '{{ object.partner_id.lang }}'
+        })
+        test_event = self.env['event.event'].create({
+            'name': 'TestEventMail',
+            # 'user_id': self.env.ref('base.user_admin').id,
+            'date_begin': datetime.now() + timedelta(hours=1),
+            'date_end': datetime.now() + timedelta(hours=2),
+            'event_mail_ids': [
+                (0, 0, {  # email 3 hours before event
+                    'interval_nbr': 3,
+                    'interval_unit': 'hours',
+                    'interval_type': 'before_event',
+                    'template_ref': 'mail.template,%i' % self.env['ir.model.data']._xmlid_to_res_id('event.event_reminder')}),
+                (0, 0, {  # sms 3 hours before event
+                    'interval_nbr': 3,
+                    'interval_unit': 'hours',
+                    'interval_type': 'before_event',
+                    'notification_type': 'sms',
+                    'template_ref': 'sms.template,%i' % self.sms_template_rem.id}),
+            ]
+        })
+        mail_scheduler = test_event.event_mail_ids
+        self.assertEqual(len(mail_scheduler), 2, 'There should be two mail schedulers. One for mail one for sms. Cannot perform test')
+
+        # Add registrations
+        self.env['event.registration'].create([{
+            'event_id': test_event.id,
+            'name': 'RegistrationUnconfirmed',
+            'email': 'Registration@Unconfirmed.com',
+            'state': 'draft',
+        }, {
+            'event_id': test_event.id,
+            'name': 'RegistrationCanceled',
+            'email': 'Registration@Canceled.com',
+            'state': 'cancel',
+        }, {
+            'event_id': test_event.id,
+            'name': 'RegistrationConfirmed',
+            'email': 'Registration@Confirmed.com',
+            'state': 'open',
+        }])
+
+        with self.mock_mail_gateway(), self.mockSMSGateway():
+            mail_scheduler.execute()
+
+        self.assertEqual(len(self._new_mails), 2, 'Mails were not created')
+        self.assertEqual(len(self._new_sms), 2, 'SMS were not created')
+
+        self.assertEqual(test_event.seats_taken, 1, 'Wrong number of seats_taken')
+
+        self.assertEqual(mail_scheduler.filtered(lambda r: r.notification_type == 'mail').mail_count_done, 2,
+            'Wrong Emails Sent Count! Probably emails sent to unconfirmed attendees were not included into the Sent Count')
+        self.assertEqual(mail_scheduler.filtered(lambda r: r.notification_type == 'sms').mail_count_done, 2,
+            'Wrong SMS Sent Count! Probably SMS sent to unconfirmed attendees were not included into the Sent Count')