The original message was received at Sat, 29 Oct 2016 18:41:58 -0700 from sales@domain.com.au [sales@domain.com.au]
----- The following addresses had fatal errors -----
[Status: Error, Address: <customerservice@domain.com.au>, ResponseCode 421, Host not reachable.]
Message will be retried for 4 more day(s)