Gmail blocks some mailman messages #111
Description
With more users in our various mailing lists fewer and fewer messages are falsely classified as "spam", but a major problem persists: Gmail blocks some eMails that it considers suspicious entirely and the addressees can not see them or teach it that it was not in fact spam.
It's likely that I have provoked this when switching all previous newsletter subscribers to the new list, but adhering to Gmail's bulk sender guidelines more closely might solve this issue.