Labels:text | diagram | map OCR: BACKBONE APPROACH TO E-MAIL Brand X Brand Z E-mail System E-mail System X.400 E-mail System Brand A Brand C E-mail System E-mail System Brand B tw Gateways E-mail System between e-mail system and X.400 FIGURE 2: In a backbone architecture, messages are translated from the native e-mail system's format into a standard format, such as X.400, then translated into the recipient e-mail system's format for delivery.