NotifyAllWatchers query

If I set up the Scrip:

OnCorrespond NotifyAllWatchers with template Correspondance

then what seems to happen is that the requestor and the AdminCCs get an
email with the correspondance in it.

This is perfect except that the AdminCCs appear to be CCed rather than
BCCed as advertised and desired.

Now looking at Notify.pm it appears that they should be BCCed, so I
speculate that there is something amiss in the way my MTA is being
invoked.

It’s exim 4 using the settings:

$MailCommand = ‘sendmailpipe’;
$SendmailArguments="-oi -t";
$SendmailPath = “/usr/sbin/sendmail”;

Where /usr/sbin/sendmail is a link to the exim binary as you might expect.

Anyone else run into this?

Thanks.

John