As part of its "Traveler Compliance Check" initiative, as of January 8, 2018, CBP began sending email notifications to VWP travelers to notify of upcoming I-94 expiration. Emails will be sent 10 days before I-94 expiration. CBP says the purpose of the emails is to remind travelers of how long they may legally remain in the U.S., and do not reflect a change in policies or enforcement. Travelers should expect to receive the notice emails from Staycompliancedonotreply@cbp.dhs.gov , and CBP warns that any email message from any other address may be fraudulent or part of a scam. Emails will be sent to the email the traveler provided when registering for ESTA. VWP travelers entering at a land border who are issued the green I-94W form are not registered in ESTA and will not receive compliance emails.