Improve the text of the administrative emails
The administrative emails are a bit scarce in their explanation what they are about. Especially for admins that don't know much about gnupg keyrings or mailinglists. It would be great to extend their content, i.e.:
This is an automated mail from the email@example.com mailinglist, which you're are an administrator of.
While doing a regular check of all subscriptions of list firstname.lastname@example.org we were pinning a matching key for the following subscriptions
This means ...
see also the initial ticket #240 (closed)