Hi Paul,
1. No, the emails do not appear in the Email log. However the invoice is marked as "Sent" and appears in the Invoice Delivery log as sent.
2. I use SMTP, however, I switched to sendmail and ran the test again and same result - not sent, not in email log and my sendmai logs show no attempt to send any email.
In all cases, if I select the invoice within the Client screen and click to send, the email gets sent successfully.
Thanks