There have been a couple of email virus outbreaks detected and blocked. These were NOT in the Oregon domain, but were sent to OSD email addresses from an external sources. Our email security/anti-virus sends a message back to the sender in these cases claiming the destination is unavailable.
Action: block '550 mailbox unavailable'
Source:
217.76.69.114
Time: 2013/02/18 16:27:29 GMT
Action: block '550 mailbox unavailable'
Source: 79.106.15.113
Time: 2013/02/18 16:29:39 GMT
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