DoCmd.SendObject doesn't display recipients in MS Outlook

[Paul]

I'm using DoCmd.SendObject to send Emails and it works as intended, except
that the recipient(s) aren't displayed in the Send folder of MS Outlook.
That is, the field under the "To" header, which shows the recipients when
you send an Email in Outlook, is blank, even though the values in the
"Subject" and "Sent" columns are displayed.

The code I'm using is:

DoCmd.SendObject , , , fnEmailList, , , , vSignatureBlock, True

where fnEmailList is a function that concatenates the Email addresses
selected by check boxes in the form.

Is there any way to get Outlook to capture the recipients of the email
message so they will be displayed in the "To" column of the "Sent Items"
folder?

Thanks in advance,

Paul