Your message did not reach some or all of the intended recipients.
Sent: Sun, 09 Jun 2013 23:54:43 +0100
The following recipient(s) could not be reached:email@example.com
Error Type: SMTP
Remote server (126.96.36.199) issued an error.
hMailServer sent: RCPT TO:<firstname.lastname@example.org>
Remote server replied: 550 Please turn authentication on
That was the error.
Somehow it is now working but i don't know what setting it was.
hotmail still blocks me but that is a separate issue, the PBL listings which i'm supposed to be removed from by now.