Messages to particular ISPs

[Mrozek]

We just switched Internet providers last week and have run into a problem. We can receive email from anyone but cannot send to everyone. We'll say about about 5% to 10% of our email is being blocked. Two of the addresses I can't send to are hosted by Time Warner and Roadrunner. We had recently run into a problem with them a few months ago when they started blocking emails that didn't resolve correctly with reverse lookup. That problem was address quickly and considered closed.

I made sure our PTR was set right with our new provider but ever since we switched last week, we can't send to certain addresses. I've checked all the blackhole lists and we are not on any of them and all of our DNS records look correct.

I can telnet successfully into the servers that are not accepting mail from our domain.

Any ideas?

 

[jbud]

Shot-in-the-dark: what's the TTL on the zone that has the PTR records in it. I've seen some that were a week long. They could be working with cached info that will eventually work its way out.

 

[Mrozek]

The TTL on our zones are 1 day. Actually, in the Win2k view, it looks like this: 0 :1:0:0
So I'm assuming that's one day. Is that the information you are talking about?