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-rw-r--r--alot/mail/headers.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/alot/mail/headers.py b/alot/mail/headers.py
index 3138c281..fa7f6414 100644
--- a/alot/mail/headers.py
+++ b/alot/mail/headers.py
@@ -14,5 +14,6 @@ SUBJECT = 'Subject'
IN_REPLY_TO = 'In-Reply-To'
REFERENCES = 'References'
+LIST_ID = 'List-ID'
X_BEEN_THERE = 'X-Been-There'
X_MAILING_LIST = 'X-Mailing-List'