Haha. UCEProtect are biggest cunts who ask for money for whitelisting. We tend to ignore them.

Did you ask spamhaus for headers of email IDs they marked as spam? Or did they give any reason?

Also, who is using your service?

Transcoding

I'm not sure what your conf is, but on a one node redis server, direct upgrade is possible.

You should the share the contents of error file with whoever you're asking help from.