MX address change

  • From: "Tiago de Aviz" <Tiago@xxxxxxxxxxxxxxx>
  • To: <exchangelist@xxxxxxxxxxxxx>
  • Date: Thu, 26 Jan 2006 17:28:05 -0200

Hello Guys/Gals!
 
I've migrated a customer's email infrastructure this saturday, where he
previously had his email all hosted on an ISP with POP3 mailboxes. Now
he has his own mail server inside, we published SMTP outside, and I've
kept his DNS zone in the same ISP where he had the mailboxes, just asked
them to change the MX address.
 
It all worked wonderfully, except that some domains are still sending
mail to their former e-mail server! I've checked that the DNS is
correctly configured, both of my DNS server are pointing to the correct
MX. (tested it thru dnsstuff.com). All tests passed!
 
My question is: how come? If there were cached responses on ISP's out
there, they already should have expired.
 
Any clues?
 
 
 
Tiago de Aviz
SoftSell - Curitiba
(41) 3340-2363
www.softsell.com.br 
 
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