# X_MAIL_EVENT_UNVERIFIED

## Means

a delivery notification is not signed by its provider

## Typical cause

no signature, a bad signature, a stale timestamp, a topic not in topicArns, a certificate URL off sns.<region>.amazonaws.com, or a SignatureVersion other than 1 or 2 (meta.reason says which)

## Fix

`sesEventReceiver({ topicArns: ['<your topic arn>'] })` — or resendEventReceiver({ secret }) with the endpoint's whsec_ secret

[Mail](/error-codes#mail)