search date in envelope if Date: header is missing

1 files changed, 12 insertions, 3 deletions

diff --git a/umessage.py b/umessage.py
index 52111f0..1ab9125 100644
--- a/umessage.py
+++ b/umessage.py
@@ -110,16 +110,25 @@ class UMessage:
             persons.append((name, mail))
         return persons
     
-    def date(self):
+    def date(self, alternative_source=False):
         """return a mx.DateTime object for the email's date or None if no date is
         set or if it can't be parsed
         """
         value = self.get('date')
-        if value:
+        if value is None and alternative_source:
+            unix_from = self.message.get_unixfrom()
+            if unix_from is not None:
+                try:
+                    value = unix_from.split(" ", 2)[2]
+                except IndexError:
+                    pass
+            
+        if value is not None:
             datetuple = parsedate(value)
             if datetuple:
                 return DateTime(*datetuple[:6])
-        return None
+        else:
+            return None