internal error on operation caused by failure to send email

[vohmar]

In most cases failure to send email notification cannot be the reason to fail the request.
Returning unhandled internal error is a a bug

One such example is with cancelling pendingUpdate using admin interface when the domain is out of zone and registrant has email address under the same domain - unandled error is returned if the system is not able to send notification to the registrant about canceled pending Update request and the status is not removed (at the same time setting the pendingUpdate status does not fail for the same reason)

Only domain:update for registrant change and domain:delete requests should fail if sending the confirmation request to the current registrant fails.

On all other cases where the email is of informative nature - the operation it self and sending emails must be kept apart. The email sendig process is started after successful completion of the update.