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:
Error Type: SMTP
Remote server (188.8.131.52) issued an error.
hMailServer sent: RCPT TO:<firstname.lastname@example.org>
Remote server replied: 550 Please turn authentication on
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