Sending to yahoo mail problem.

[cmptrnerd]

We installed Exchange 2007 standard and I'm having a strange issue with sending mail to yahoo. The message shows it is sent and I went into message tracking and it shows a 250 recipient ok, but it never makes it to the yahoo mailbox and does not show up in spam mail on yahoo. Has anyone seen this issue?

Mark

Mark

 

[ShackDaddy]

You might try building a unique send connector just for the Yahoo domain and route that mail through a smarthost and see if the behavior is different. I occasionally have to do that for certain domains, usually AOL.

Dave Shackelford
Shackelford Consulting

 

[Zelandakh]

Check your rDNS entry for your domain - Yahoo uses rDNS for spam checking and a lot of companies overlook this.

 

[cmptrnerd]

I'm still not sure why Yahoo was blocking our ip. We had reverse dns setup and I checked with the spamhaus and other places and the ip was not listed as a blocked address.

The problem was that I was depending on the message tracking database and that only shows the first line of the response between server and while the Yahoo mail server was responding with a 250 ok, it was later responding that it was deferring the message. I had to turn on logging for the transport and go thru the logs to get my final answer.

All I can guess is that Yahoo blocked a whole block of IP addresses and after we contacted them with our issue, they opened up our servers IP.

Mark