--- a/src/bnpparibas.py	Wed Feb 25 01:44:50 2015 +0100
+++ b/src/bnpparibas.py	Wed Mar 25 01:38:07 2015 +0100
@@ -404,7 +404,9 @@
         cmd = [ "gpg", "--homedir", self.homedir, "--batch", "--yes", "--no-options", "--armor",
                 "--local-user", sender, "--recipient", recipient, "--sign", "--encrypt"]
         p = subprocess.Popen(cmd, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
-        encdata = p.communicate(input=message.encode('utf-8'))[0].decode('ascii')
+        encdata, err = p.communicate(input=message.encode('utf-8'))[0].decode('ascii')
+        if p.returncode:
+            raise RuntimeError(p.returncode, err)
         return encdata