diff --git a/rattail/mail.py b/rattail/mail.py
index 25bad96f048cdbb60d266f32b7205212d503472f..e9e74b49bdb08fa75fa54b7b50f012100498ea2f 100644
--- a/rattail/mail.py
+++ b/rattail/mail.py
@@ -443,6 +443,7 @@ class Email(object):
         return normalized
 
     ATTACHMENT_MIME_MAP = {
+        '.doc': 'application/msword',
         '.pdf': 'pdf',
         '.xls': 'vnd.ms-excel',
     }