ud-mailgate: include name of unknown host in error message

diff --git a/ud-mailgate b/ud-mailgate
index e6b54a9..fd70c37 100755 (executable)
--- a/ud-mailgate
+++ b/ud-mailgate
@@ -297,7 +297,7 @@ def DoSSH(Str, Attrs, badkeys, uid):
          if not machine_regex.match(m):
             return "machine specification for ssh key contains invalid characters"
          if m not in ValidHostNames:
-            return "unknown machine used in allowed_hosts stanza for ssh keys"
+            return "unknown machine {} used in allowed_hosts stanza for ssh keys".format(m)
 
    (fd, path) = tempfile.mkstemp(".pub", "sshkeytry", "/tmp")
    f = open(path, "w")