I'm composing a follow-up email to my university's student government, now in German, as I've received no response to my query in English. I don't have individual names as the published information is just email addresses for the different Referate. I'm looking for suggestions on how to begin my email as I feel that "Sehr geehrte Damen und Herren" is way too rigid and formal for someone likely in the same age group or maybe even younger, their position in student government notwithstanding. Since my original email was a request (I began my email in English with "Dear friends of the [such and such department]"), I want to remain friendly and not get too formal, but at the same time do better than "Hallo".
I looked in emails sent from student government to us and we are addressed as "Mitstudierenden", but this doesn't sound like the right choice here. Is there a better form of address which expresses a sense of collegiality, i.e. of being peers, instead of talking up or down to someone?
Thanks in advance for any suggestions.