Hi,
today I was unable to register me, because my IP is blacklisted by SORBS. Please read this (possible all 5 parts) it's a little bit outdated, but still valid. https://wordtothewise.com/2010/12/gfi-s ... ul-part-5/
Never mind, did registration thru anonymouse.org
Regards
Pietro
BTW my today IP is dynamic IP assigned by one of big italian ISP, so even if it'd be true that somebody sent spam from this IP two month ago, I sure wasn't a sender/spammer