Kernrechtsfrage
Whether the 9 January 2001 tax assessment was validly served on the appellant
Extrahierter Entscheid
Yes. Service through the former spouse was valid because the postal delivery at the home address could rely on an implied authorization; the appellant had allowed her to receive his mail and had not notified the tax authority otherwise.
Extrahierte Begründung
An registered mail item is deemed served when collected after a pickup notice. The authority could send it to the home address; the spouse's receipt and the appellant's failure to inform the tax authority of a different arrangement were attributable to him.