[eldridgea]

The US government doesn't need a warrant for emails older than 180 days that are still on the server.

Emails older than that are considered abandoned[0] and treated the same as an abandoned storage unit, due to an old law from the time when email was regularly downloaded and purged from the server by local email clients.

[0] https://www.businessinsider.com/when-can-the-government-read...