Google making some changes to help reduce spam

Google is making some changes to help reduce spam.
It is adding new requirements for bulk senders, defined as those who send more than 5,000 messages to Gmail addresses in a day.
They will have to authenticate their addresses, stay below a spam rate threshold, offer a one-click unsubscribe button in their emails, and process the unsubscribe request within two days.
The changes go into effect in February.
Google announced Yahoo will implement the same changes.