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Domain footprint: tutanota.de
Resolved live just now — where this domain's services actually run, with each address attributed by OrgIndex. A DNS observation, not registry data: many organisations run entirely on providers' networks and hold no IP space of their own.
Mail:
mail.tutanota.de → Tutao GmbH
SPF sends via:
spf.tutanota.de
Separately, 1 organisation whose name resembles “tutanota.de” — these may be unrelated to the domain above.