The "1.2k" means approximately 1,200 account credentials. "VALID" means someone has tested them against Microsoft’s login servers (using automated tools) and confirmed they currently work.
At its core, the term breaks down into three distinct parts: 1.2k VALID HOTMAIL.txt
Without "VALIDMAIL," your open rate in the lifestyle sector will likely hover below 10%. With a validated list like the 1.2k file, experienced marketers report open rates between 35% and 45% because they are reaching real people who actually opted into entertainment verticals. The "1