How can I get the real Emailaddress of a recipient?

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http://serverfault.com – a user in out Company has 2 mail-addresses on one Exchange-Mailbox. e.g test@... and test1@... the Primary SMTP-address off the Mailbox is test@. If I send a message to test1@, load it using EWS and parse through the TORecipients-Collection there is exactly one emailadress. But the mailaddress EWS gives to me is test@... and not test1@... where I sent the mail. My problem is, that all mails sent to test@ should be imported in our CRM using my program. All mails sent to test1@... must not be imported. In real life both mailaddresses are from my Boss. One is used for normal purposes the other o (HowTos)