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diff --git a/service/src/pixelated/adapter/services/tag_service.py b/service/src/pixelated/adapter/services/tag_service.py
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+#
+# Copyright (c) 2014 ThoughtWorks, Inc.
+#
+# Pixelated is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Pixelated is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with Pixelated. If not, see <http://www.gnu.org/licenses/>.
+from pixelated.adapter.model.tag import Tag
+
+SPECIAL_TAGS = {Tag('inbox', True), Tag('sent', True), Tag('drafts', True), Tag('trash', True), Tag('ALL', True)}
+
+
+def extract_reserved_tags(tags):
+ tags = [tag.lower() for tag in tags]
+ return {tag.name for tag in SPECIAL_TAGS if tag.name in tags}