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-rw-r--r--src/leap/mail/incoming/service.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/leap/mail/incoming/service.py b/src/leap/mail/incoming/service.py
index 0b2f7c2..23c216c 100644
--- a/src/leap/mail/incoming/service.py
+++ b/src/leap/mail/incoming/service.py
@@ -435,7 +435,7 @@ class IncomingMail(Service):
def add_leap_header(ret):
decrmsg, signkey = ret
- if (senderAddress is None or
+ if (senderAddress is None or signkey is None or
isinstance(signkey, keymanager_errors.KeyNotFound)):
decrmsg.add_header(
self.LEAP_SIGNATURE_HEADER,