Unable to get emails to display "on Befalf of", when sent using EWS API

Wayne Johnson 21 Reputation points
2022-11-28T20:33:08.323+00:00

I am using the EWS API to send emails on behalf of an email address other than that of the mailbox I am using. I don't want to copy the email to the Drafts & SentItems folders of the mailbox I am send in behalf of, so I can't follow the standard advice for this. I want to keep the emails in the SentItems folder of the sending MailBox. However, when I attempt to do this via Outlook 2016,

  • The email is copied to the sending mailbox's SentItems
  • The "on behalf of text" is correctly displayed in the title.

But when I try to do this using EWS API, everything seems to work the same except the "on half of text" is not displayed. Is there another setting that controls when that text is displayed?

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