Is there an issue with LIGHTNING?

[Sergio]

Hi,
emails are not getting thru, I am receiving this errors:

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

support@xxxxxxx.xxx
(generated from root@server.xxxxxxxx.xxx)
SMTP error from remote mail server after RCPT TO:<soporte@secmashost.com>:
host lightning.websitewelcome.com [70.85.248.162]:
550-Verification failed for <root@server.xxxxxxxx.xxx>
550-unrouteable mail domain "server.server.xxxxxxxx.xxx"
550 Sender verify failed

It seems that resolver in lightning is not working. Any idea?

[Lincoln]

If you recently started an account with Hostgator, I would recommend deleting and then recreating the email accounts if you can. That did the trick for me.