Receiving Bellsouth emails after making DNS changes

So I did a DNS transfer from Network Solutions to GoDaddy.  I thought I had repopulated my A records and MX records correctly.  Funny thing is that now, people outside our network, get to our internal servers as they should.  Email flows inbound and outbound, but with one exception:  We can send to AT&T accounts and bellsouth accounts just fine.  However, we cannot receive emails from these domains.  I checked our SMTP filter, the emails never hit our network.  What could this be?
thanks
Omar ValerioCIO / CTO / IT DirectorAsked:
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AlanNMMXCommented:
Hi,

Is this a recent change? Less than 48 hours ago, if so might just be the old DNS entries are cached.
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Omar ValerioCIO / CTO / IT DirectorAuthor Commented:
I had read it could take that long, but I've never experienced it before.  Everything is "magically" is it should be
thanks
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