As of February 2024 (fully enforced through 2025), both and Yahoo have strict new requirements for bulk senders. Microsoft (Outlook/Hotmail) is following closely.
The existence of such lists for 2025 highlights a permanent reality of the internet: your data is only as secure as the weakest service you use. To defend against being a line item in a .txt file, experts recommend: @yahoo.com @gmail.com @hotmail.com txt 2025
