diff --git a/addons/mail/models/mail_mail.py b/addons/mail/models/mail_mail.py
index 1fed4e7045c..5356e525ea4 100644
--- a/addons/mail/models/mail_mail.py
+++ b/addons/mail/models/mail_mail.py
@@ -373,19 +373,30 @@ class MailMail(models.Model):
         if self.email_to:
             email_to = tools.email_split_and_format(self.email_to)
             email_list.append({
+                'email_cc': [],
                 'email_to': email_to,
                 # keep raw initial value for incoming pre processing of outgoing emails
                 'email_to_raw': self.email_to or '',
                 'partner_id': False,
             })
-        # TODO: add all cc once, either to the "To", either as a single entry (do not mix
+        # add all cc once, either to the first "To", either as a single entry (do not mix
         # with partner-specific sending)
-        email_cc = tools.email_split(self.email_cc)
+        if self.email_cc:
+            if email_list:
+                email_list[0]['email_cc'] = tools.email_split(self.email_cc)
+            else:
+                email_list.append({
+                    'email_cc':  tools.email_split(self.email_cc),
+                    'email_to': [],
+                    'email_to_raw': False,
+                    'partner_id': False,
+                })
         # specific behavior to customize the send email for notified partners
         for partner in self.recipient_ids:
             # check partner email content
             email_to = [tools.formataddr((partner.name or '', partner.email or 'False'))]
             email_list.append({
+                'email_cc': [],
                 'email_to': email_to,
                 # keep raw initial value for incoming pre processing of outgoing emails
                 'email_to_raw': partner.email or '',
@@ -415,7 +426,7 @@ class MailMail(models.Model):
                 'attachments': email_attachments,
                 'body': body,
                 'body_alternative': body_alternative,
-                'email_cc': email_cc,
+                'email_cc': email_values['email_cc'],
                 'email_from': self.email_from,
                 'email_to': email_values['email_to'],
                 'email_to_raw': email_values['email_to_raw'],
diff --git a/addons/test_mail/tests/test_mail_mail.py b/addons/test_mail/tests/test_mail_mail.py
index 164161079ca..b002fab7d01 100644
--- a/addons/test_mail/tests/test_mail_mail.py
+++ b/addons/test_mail/tests/test_mail_mail.py
@@ -195,9 +195,10 @@ class TestMailMail(TestMailCommon):
         self.assertSentEmail(mail.env.user.partner_id,
                              ['test.rec.1@example.com', '"Raoul" <test.rec.2@example.com>'],
                              email_cc=['test.cc.1@example.com', 'test.cc.2@example.com'])
-        # Mail: currently cc are put as copy of all sent emails (aka spam)
+        # don't put CCs as copy of each outgoing email, only the first one (and never
+        # with partner based recipients as those may receive specific links)
         self.assertSentEmail(mail.env.user.partner_id, [self.user_employee.email_formatted],
-                             email_cc=['test.cc.1@example.com', 'test.cc.2@example.com'])
+                             email_cc=[])
         self.assertEqual(len(self._mails), 2)
 
     @mute_logger('odoo.addons.mail.models.mail_mail')