getDefaultEmailDomain() {
        if (this.#managedEmailEnabled()) {
            const customSendingDomain = this.#managedSendingDomain();
            if (customSendingDomain) {
                return customSendingDomain;
            }
        }

        const url = this.urlUtils.urlFor('home', true).match(new RegExp('^https?://([^/:?#]+)(?:[/:?#]|$)', 'i'));
        const domain = (url && url[1]) || '';
        if (domain.startsWith('www.')) {
            return domain.substring('www.'.length);
        }
        return domain;
    }
@deprecated
Please don't make up new email addresses: use the default email addresses