belongsTo(MailAlias::class, 'alias_id'); } // <-- hier auf MailUser verweisen, nicht Mailbox public function mailUser(): BelongsTo { return $this->belongsTo(MailUser::class, 'mail_user_id'); } public function getLabelAttribute(): string { if ($this->relationLoaded('mailUser') && $this->mailUser) { // falls MailUser ein Attribut 'address' hat (z.B. office@pixio.at) return '@'.$this->mailUser->address; } return (string) $this->email; } }