Represents a bounce notification from a Resend webhook event.
Resend sends subType and type in camelCase, unlike the snake_case envelope fields.
the bounce message describing the reason for the bounce.
the bounce sub-type, such as Suppressed or MessageRejected, or null if not sent.
Suppressed
MessageRejected
the bounce type, such as Permanent or Transient, or null if not sent.
Permanent
Transient