I was trying to send an Email Quote back to Nirtec: sales@nirtec.com
This was using the "reply button"... I got an email back saying:
sales@nirtec.com
Unrouteable address
I contacted my Email Hosting Service and the support Tech said this:
The domain nirtec.com has no MX record, so it's not able to receive email.
They checked Google and a couple of other services that have those records.
Not sure how you can fix that, but I thought it would be important to let you know somehow.
Sincerely,
Marc