The issue has been resolved.
May 24, 18:52 PDT
Email delivery has been restored by moving to a back system. Queued email has been transmitted for delivery to customer email service providers.
May 24, 15:26 PDT
Email is being delivered sporadically via our email service provider. No email is being lost. Its queued for delivery. We will post updates as more details become available.
May 24, 15:14 PDT
We have identified the issue downstream with our email services provider and are working with them to resolve the issue.
May 24, 15:04 PDT
Engineering is currently investigating delay of voicemail notifications being delivered to e-mail.
May 24, 07:40 PDT