But it's listed in level 2.
What means listed at UCEPROTECT-Level 2?
UCEPROTECT Network operates three levels of blacklisting, so our users can make the decision how strong they want to filter.
While UCEPROTECT-Level 1 lists single IP's only, UCEPROTECT Level 2 is an escalation list.
According to the table above allocations get listed at Level 2 if there are too many Level 1 listings (spam sending IP's) in that ranges.
In other words: One or several networks which your IP belongs to have send too much spam within the last week.
That is the reason why your mail has been blocked.
Level 2 is basically nothing more than pure mathematics based on the number of Level 1 listed IP's.