I'm listed on razor2.sf.net blacklist. How do I get delisted?
The short answer to this is that you don't.
The longer and more complex answer is that Razor2 is not a normal blacklist (RBL/DNSBL) that takes delisting requests. It's a system that builds from the content of the email and then makes a distance comparison between it and known spams in a cloud database.
Razor2 is owned by Cloudmark IP Reputation Portal According to the Razor2 FAQ Page
Q: Razor has blacklisted my email address. I am not a Spammer, please help! Razor DOES NOT whitelist email addresses or host names. It works by computing signatures on the body of the content and checking these signatures against a database of known spam. If you believe mail is being incorrectly blocked, most likely you have misconfigured your mail system.
Q: How does razor decide which submissions to trust when declaring email to be spam? Razor uses a Truth Evaluation System (TeS) to assign a trust level, or rating, to those who make reports. In general reporting spam and issuing revokes for nonspam help your rating. Conversely reporting things such as mailing lists that a large number of users will have to revoke will hurt your rating.
What this means is that email signatures end up in the Razor database because mail administrators and end-users have reported them as spam. There is no "delisting" option within Razor.
There is also nothing that can be done on the server or within the cPanel & WHM software to address this. The problem is likely within the messages being sent and the fact that some users have considered it to be spam and reported it as such.