I have a php script that that sends email from sendmail on linux a box to users that are exchange 2007 clients. (Same LAN) Has worked great until today.

The php mail script will send the email to anyone/any address ( inside or out) that isn't on the exchange server. Don't know what has happened.

I am not using the exchange server for a relay, simply sending an email to a user on it just like anyone would.

I can telnet from the sendmail server to the exchange server and back on 25 and send email from from command line. Users get email this way.

So I am concluding that exchange doesn't like the email being sent with php all of a sudden for some reason which is why I am posting here with the PHP gods.

Nothing on either box has changed since i set it up over a year and a half ago.

Thanks in advance for the help.

Stan

    Are you getting any kind of bounce - if so can you post the full header?

    One more thing - were there any changes made to your firewall or DNS?

    We just had a similar issue were I'm at and tracked it done as being a DNS issue and it had nothing to do w/ our email servers.

    j

      No bounce at all.

      We did just rebuild our internal active directory dns right before this happened.

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