diff -r 805c15aa298a libs/ldaplib/domain.py
--- a/libs/ldaplib/domain.py    Wed Dec 19 12:10:39 2018 +0800
+++ b/libs/ldaplib/domain.py    Wed Dec 19 22:46:13 2018 +0800
@@ -1321,50 +1321,37 @@

     elif profile_type == 'bcc':
         # Enable/Disable recipient bcc.
-        if 'recipientbcc' in form:
-            mod_type = 'add'
-        else:
-            mod_type = 'delete'
-
-        result = ldap_lib_general.add_or_remove_attr_values(dn=domaindn,
-                                                            attr='enabledService',
-                                                            values=['recipientbcc'],
-                                                            action=mod_type,
-                                                            conn=conn)
-        if result[0] is False:
-            return result
-
-        # Update recipient bcc address.
-        rcpt_bcc = form_utils.get_single_value(form,
-                                               input_name='recipientBccAddress',
-                                               default_value=None,
-                                               is_email=True,
-                                               to_string=True)
-        mod_attrs += ldaputils.get_mod_replace(attr='domainRecipientBccAddress',
-                                               value=rcpt_bcc)
-
-        # Enable/Disable sender bcc.
-        if 'senderbcc' in form:
-            mod_type = 'add'
-        else:
-            mod_type = 'delete'
-
-        result = ldap_lib_general.add_or_remove_attr_values(dn=domaindn,
-                                                            attr='enabledService',
-                                                            values=['senderbcc'],
-                                                            action=mod_type,
-                                                            conn=conn)
-        if result[0] is False:
-            return result
-
-        # Update sender bcc address.
-        sender_bcc = form_utils.get_single_value(form,
-                                                 input_name='senderBccAddress',
-                                                 default_value=None,
-                                                 is_email=True,
-                                                 to_string=True)
-        mod_attrs += ldaputils.get_mod_replace(attr='domainSenderBccAddress',
-                                               value=sender_bcc)
+        # form input name is same as ldap attribute value.
+        for _input_name in ['recipientbcc', 'senderbcc']:
+            if _input_name in form:
+                mod_type = 'add'
+            else:
+                mod_type = 'delete'
+
+            _qr = ldap_lib_general.add_or_remove_attr_values(dn=domaindn,
+                                                             attr='enabledService',
+                                                             values=[_input_name],
+                                                             action=mod_type,
+                                                             conn=conn)
+
+            if not _qr[0]:
+                return result
+
+        # Update sender/recipient bcc address.
+        for (_input_name, _attr) in [('senderBccAddress', 'domainSenderBccAddress'),
+                                     ('recipientBccAddress', 'domainRecipientBccAddress')]:
+            _bcc_addr = form_utils.get_single_value(form,
+                                                    input_name=_input_name,
+                                                    default_value='',
+                                                    is_email=True,
+                                                    to_string=True)
+
+            if _bcc_addr:
+                mod_attrs += ldaputils.get_mod_replace(attr=_attr,
+                                                       value=_bcc_addr)
+            else:
+                mod_attrs += ldaputils.get_mod_replace(attr=_attr,
+                                                       value=None)

     elif profile_type == 'relay':
         # transport
diff -r 805c15aa298a templates/default/macros/general.html
--- a/templates/default/macros/general.html Wed Dec 19 12:10:39 2018 +0800
+++ b/templates/default/macros/general.html Wed Dec 19 22:46:13 2018 +0800
@@ -1550,7 +1550,7 @@
 {%- endmacro %}

 {% macro display_recipient_bcc(address='', label='', input_name='recipientBccAddress') -%}
-    {% if address is sameas none %}
+    {% if not address %}
         {% set address = '' %}
     {% endif %}

@@ -1566,7 +1566,7 @@
 {%- endmacro %}

 {% macro display_sender_bcc(address='', label='', input_name='senderBccAddress') -%}
-    {% if address is sameas none %}
+    {% if not address %}
         {% set address = '' %}
     {% endif %}