関連ワード:  is it ok to say dear sirs    is it ok to write dear sirs in email    is it ok to write dear sirs    is it ok to say dear sir or madam    is it okay to say dear sir madam    is it ok to say dear mr    is it ok to write dear sir madam    is it ok to write dear mr    is it still ok to say dear sir madam    is it correct to say dear sirs