权威例句
SMTP Service ExtensionsSMTP Service ExtensionsSMTP Service ExtensionsSimple Mail Transfer Protocol (SMTP) Service Extension for Delivery Status Notifications (DSNs)SMTP Service Extension for 8bit-MIMEtransportSMTP Service Extension for Message Size DeclarationSMTP Service Extension for Message Size DeclarationSMTP Service Extension for 8-bit MIME TransportSMTP Service Extensions for Transmission of Large ...SMTP Service Extension for Returning Enhanced Error Codes