"My Yahoo account (Boris) is completely blocked from receiving system automated emails from the domain katfile.com and katfile.biz. This block happens entirely at the inbound server level (graylisted/dropped), meaning the emails do not even enter the Spam folder or trigger any Blocked List rules. As a user, I request your Postmaster team to inspect the inbound delivery log and white-list the sender IP of KatFile immediately. Thank you."