There was the incident in this morning. It started from my dad has a trip to China this week, so he askedme how to activate auto responder for his mail account. I shown him how to configure the mail auto responder, and we discuss about one configuration, the parameter Limit responses to one per day per sender = enable. I asked my dad does he like to enable it or not, he just said no, don't need. I didn't realize this parameter for a few days until today morning.
Last night I checked all incoming mail before went to bed. When I woke up in the morning with a big shock, there was more than 800 mails in my daddy mailbox!!! and most of them are auto-responding message from himself. I think my dad was send mail to himself, and the auto-responder system send reply message to himself, when the mailbox got the new message from himself, it start to reply to himself again, and it all start over all the time like a chain reaction. Fortunately that I found in within 8 hours after it started the chain (every 2 mails per minute), otherwise my company mail server will be down soon... lol

