en-US Home > Categories > Microsoft Outlook 2016 > Outlook Options > Preferences > E-mail Options > Advanced E-mail Options > When sending a message When sending a message 8 Group Policy settings under When sending a message. Browse the sub-folders and settings below. Settings Add properties to attachments to enable Reply with Changes Allow commas as address separator Automatic name checking Delete meeting request from Inbox when responding Messages expire after (days) Set importance Set sensitivity Suggest names while completing To, Cc, and Bcc fields