I know what's going on. An old bug I never fixed: if you enter a subject line BUT DOES NOT WRITE A MESSAGE in the main body, the confirmation is shown but no message is actually sent.
I've just sent a PM to @hio77 now - he probably got a notification but not PM from me.
yep... I was just sitting here frustratingly looking at my emails and geekzone going someones still doing it!
That's really not a cool bug..