diff --git a/core/admin/mailu/models.py b/core/admin/mailu/models.py
index a3fc15a4..30a2ed64 100644
--- a/core/admin/mailu/models.py
+++ b/core/admin/mailu/models.py
@@ -72,7 +72,7 @@ class CommaSeparatedList(db.TypeDecorator):
         return ",".join(value)
 
     def process_result_value(self, value, dialect):
-        return filter(bool, value.split(",")) if value else []
+        return list(filter(bool, value.split(","))) if value else []
 
 
 class JSONEncoded(db.TypeDecorator):
diff --git a/core/admin/mailu/ui/forms.py b/core/admin/mailu/ui/forms.py
index 40a56a82..ac4f0e19 100644
--- a/core/admin/mailu/ui/forms.py
+++ b/core/admin/mailu/ui/forms.py
@@ -32,6 +32,14 @@ class DestinationField(fields.SelectMultipleField):
             if not self.validator.match(item):
                 raise validators.ValidationError(_('Invalid email address.'))
 
+class MultipleEmailAddressesVerify(object):
+    def __init__(self,message=_('Invalid email address.')):
+        self.message = message
+
+    def __call__(self, form, field):
+        pattern = re.compile(r'^([_a-z0-9\-]+)(\.[_a-z0-9\-]+)*@([a-z0-9\-]{2,}\.)*([a-z]{2,4})(,([_a-z0-9\-]+)(\.[_a-z0-9\-]+)*@([a-z0-9\-]{2,}\.)*([a-z]{2,4}))*$')
+        if not pattern.match(field.data.replace(" ", "")):
+            raise validators.ValidationError(self.message)
 
 class ConfirmationForm(flask_wtf.FlaskForm):
     submit = fields.SubmitField(_('Confirm'))
@@ -101,9 +109,7 @@ class UserSettingsForm(flask_wtf.FlaskForm):
     spam_threshold = fields_.IntegerSliderField(_('Spam filter tolerance'))
     forward_enabled = fields.BooleanField(_('Enable forwarding'))
     forward_keep = fields.BooleanField(_('Keep a copy of the emails'))
-    forward_destination = fields.StringField(
-        _('Destination'), [validators.Optional(), validators.Email()]
-    )
+    forward_destination = fields.StringField(_('Destination'), [validators.Optional(), MultipleEmailAddressesVerify()])
     submit = fields.SubmitField(_('Save settings'))
 
 
diff --git a/core/admin/mailu/ui/views/users.py b/core/admin/mailu/ui/views/users.py
index 51dfdc13..4cbe7a97 100644
--- a/core/admin/mailu/ui/views/users.py
+++ b/core/admin/mailu/ui/views/users.py
@@ -7,7 +7,6 @@ import flask_login
 import wtforms
 import wtforms_components
 
-
 @ui.route('/user/list/<domain_name>', methods=['GET'])
 @access.domain_admin(models.Domain, 'domain_name')
 def user_list(domain_name):
@@ -92,9 +91,16 @@ def user_settings(user_email):
     user_email_or_current = user_email or flask_login.current_user.email
     user = models.User.query.get(user_email_or_current) or flask.abort(404)
     form = forms.UserSettingsForm(obj=user)
+    if isinstance(form.forward_destination.data,str):
+        data = form.forward_destination.data.replace(" ","").split(",")
+    else:
+        data = form.forward_destination.data
+    form.forward_destination.data = ", ".join(data)
     if form.validate_on_submit():
+        form.forward_destination.data = form.forward_destination.data.replace(" ","").split(",")
         form.populate_obj(user)
         models.db.session.commit()
+        form.forward_destination.data = ", ".join(form.forward_destination.data)
         flask.flash('Settings updated for %s' % user)
         if user_email:
             return flask.redirect(