OK, so I'm a small time email admin. I work for a company with approximately 700 email users, nothing too big or exciting. We send and receive several thousand messages a day, and block many thousands of SPAM messages a day. Recently, we noticed that our outbound queues were backing up. Of course there's always some traffic hung up outbound, people practising greylisting, email address typos, mailboxes that are full or temporarily unreachable, but we set a threashold and send alerts when the outbound queue goes over. When we started getting alarms this time I went in a took a look a noticed that 90% of the mail in the outbound queue was to Yahoo.com addresses. Things only went downhill from there.
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