Email Blacklist

Good Morning.

Seeing from our email server that we appear to be having a email delivery issue that appears to be related to your internal blacklist.   I was attempting to find the process for review and verification that you folks use.  I found a lot of articles and some of them appear to no longer be valid.  Could you please link me you most recent article so I can make sure we are following your process to review the issue and correct it?

I have verified that we not on any blacklist that is external currently (Such as SpamHaus..etc)