Mail merge, where can I find sent email

Hi,
I sent email using “mail merge wizard” of libreoffice write to exchange server.
Everything went well and I’m really happy about how to all thing work so far.

I’m just confused about where I can see which mail was sent. I look at the history in the exchange web interface and didn’t see any mail nor didn’t I get any report after the mails where successfully sent.

Thank you for your time