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He can decrease the TTL in DNS' mx record to very low, say 5 minutes. But I don't think he'll lose mail because if the host is unreachable, usually the mail will be held for 1 week.

dennis2 (Dennis)
(#154360@0)
2001-8-3 -04:00
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Back To Topic: 还有一个Exchage 5.5的问题:我们公司要换ISP,如何把新的IP地址加入Exchange server to send email to ourside with new IP address,not throught old one. Thanks!

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