I know about mxtoolbox. I used it when i was setting up mail server, so everything is configured correctly.
And IP blacklisted in just 1 of 94, but it is enough for sent mail to land in Spam folder 😞
By the way, this is what my host answered:
Big mail providers (e.g. Gmail, Hotmail, Yahoo) are not using the UCEPROTECT filters at all and e-mails to those providers are therefore not affected by this listing. Even smaller mail servers using the UCEPROTECT filters will most likely not include the Level 3 rules since UCEPROTECT themselves consider the Level 3 filter as too strict.
It can't be true, since i see effect of this UCEPROTECT. I did tests and my validation emails are landing in Spam folder (even on Gmail). Before everything was fine.