Reply mail to x-subscribe: email fpr contains no fingerprint
The reply mail sent by schleuder to a mail like this:
x-listname: foo@bar.com
x-subscribe: baz@example.com 0xFA66666AA6B66666
looks like:
baz@example.com has been subscribed with these attributes:
Fingerprint:
Admin? false
Email-delivery enabled? true
so the fingerprint is blank / omitted.