For messages sent with vvvv.org’s internal system (message-to-mail), Gmail gives me warnings: “This message may not have been sent by: ****”, phishing alert, all that.
So I decided to click through to the reasons and there was stated that “Kontaktieren Sie diesbezüglich den Absender oder den Eigentümer der Mailingliste. Die Warnung deutet in der Regel darauf hin, dass sie die bewährten Vorgehensweisen für die E-Mail-Authentifizierung nicht befolgen.” (sorry englishmen: its about contacting the sender because he doesn’t use proper authentification).
So I thought I’d just do that and contact you about that. Don’t know how other systems besides Google’s handle it and if mails might go directly to spam there.
(Solution might be to use a longer, 1024 bit signing key or something: https://support.google.com/mail/answer/180707?hl=de)