Stale records in DNS



Hello,
Using SBS 2003.
We noticed that we couldn't send emails to known good addresses.
An MX record was changed on one of these addresses recently.
On the server, when I do an nslookup, it still shows the old MX.
I've tried clearing the cache, and scavenging, but it still shows the
old.
What do I need to do?
TIA!

.



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