How are legacyExchangeDn and proxyAddresses attributes used when the message is processed by Exchange server?
a. When the message is submitted by using SMTP client, the SMTP address is used to submit the message. In addition, the Sender and Recipient are resolved by searching the proxyAddresses attribute. For example, if the recipient’s SMTP domain is configured as authoritative domains but the recipient email address cannot be found in proxyAddresses attribute of all the users. Then, a NDR message will be generated indicated that the user does not exist. In contrast, if the message sent to an external recipient, nevertheless, the recipient email address can be found in the proxyaddresses attribute of the local user, the message will be delivered to the local user instead of the external recipient. b. When the message is submitted by using MAPI client such as Outlook or OWA, the legacyExchangeDn is used to submit the message. Therefore, if the submitted recipient’s legacyExchangeDn cannot be found in AD user object, a NDR message will be generated indicated that the recipient does not exist. T
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