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ok, everything still up and running, was also able to send conf e-mails. Clearly fail2ban caused the issue.
so this is what I did:
I will install my stack and see how it evolves. As said the problem only occurred about 24hrs after the original droplet creation.
added my stack and the DNS-settings, everything working. Possibly fail2ban was the issue, this is the only element still missing from the original configuration.