You don't need to trigger the delivery engine if you setup a cron call as described on my site (www.satollo.net) on the delivery engine chapter.
only when i click "trigger the delivery engine" adds 5 more to "total sent"
i did what you describe about delevery engine at my host provider (A2 hosting) please see the printscreen if is every thing ok
after i did that, the only diference its that now i recive every 5 minutes this email at firstname.lastname@example.org whit this message:
"--2013-10-15 07:00:01-- http://sercolor.pt/wp-cron.php
Resolving sercolor.pt... 126.96.36.199
Connecting to sercolor.pt|188.8.131.52|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 0 [text/html]
Saving to: `wp-cron.php'
0K 0.00 =0s
2013-10-15 07:00:02 (0.00 B/s) - `wp-cron.php' saved [0/0]
Can you see what im doimg wrong?
you can see here a print screnn of diagnostic page