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450 Error telnet to bellsouth.net

Suddenly within the last few days, we can't sent mail to bellsouth.net.  I did a mx lookup on the domain and found the mail server is now an ATT server.  But when I telnet to it from my exchange server, I get a 450 busy  try again later.  

The connection is then disconnected.

Simon, this looks like it's right up your alley.  :)

Bobo
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Bill Apperson
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Bill Apperson
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Stacy SpearPresident/Principal ConsultantCommented:
AT&T is experiencing numerous issues integrating BellSouth. Could be the 10,000 folks they pink slipped. Our secondary connections been dropping in and out since Sunday, with no relief in site. Luckily for us, they are secondary.
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Bill AppersonSystems EngineerAuthor Commented:
Yes darkstar, I've heard that too.  What I can't figure out is why I can telnet to the ATT mailserver from home, (charter cable) but not from work. (Paetec bonded T-1's)  Both mailservers listed at MXToolbox return 450 Busy - Try again later.  I have a boss who doesn't understand email issues and is hot that he can't send to bellsouth.net domain.  

I've tried to telnet to the IP addresses  too, so I don't think it's a DNS issue.

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Stacy SpearPresident/Principal ConsultantCommented:
They have IronPorts sitting as their gateways, If they don't like you, they can give back whatever error code they want. I just telnet successfully into both of their gateways without issue too.

Is all your mail stopping or only a few pieces? Do they eventually go through? They could be rate limiting you.
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Bill AppersonSystems EngineerAuthor Commented:
All mail gets rejected.  I have 2 domains on 2 different IP Addresses in the same range.  Mail from both domains is being rejected.  You would think if they didn't like us, they would give us a clearer rejection message.  As is, the NDR the sender gets is a vague "couldn't send in the time allowed" .
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Stacy SpearPresident/Principal ConsultantCommented:
Call them up and ask. If I am limiting someone, I give the clear response of too many recipients this hour or whatever frame it is.
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Bill AppersonSystems EngineerAuthor Commented:
Great idea, but trying to find a NOC contact at bellsouth/ATT isn't as easy as it sounds.  
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Stacy SpearPresident/Principal ConsultantCommented:
I had one, but she was one of the 10,000. Let me dig around.
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