Yahoo Deferred Messages

We have been getting yahoo deferred messages, though this is only from one domain but we are actually trying to figure out what is causing the problem , I retraced my steps and it occured after I upgraded Exim rules, I still have to examine exim configuration and maybe I missed something, as usual, Exim configuration has been backed up before upgrading it, will be posting the steps once I am done.

Yahoo's answer wasn't helping that much so we decided to make our own investigation and the mail logs are going to tell us a lot of things. One troubleshooting tool that is very handy for us in this case is the CMQ from freeservers, its a free script for mail queues as well as troubleshooting them, though we are still checking on why the change password doesn't work as well.

Have a great weekend guys :)