zyGrib

In requesting from gribauto I am getting the following message:

<gribauto@zygrib.org>: host mx00.1and1.fr[212.227.15.41] said: 550-Requested
action not taken: mailbox unavailable 550 invalid DNS MX or A/AAAA resource
record (in reply to MAIL FROM command)

Below are the headers and the request sent (showing **** in place of my Code below) -- is there something wrong here? I'm not sure what the Zygrib error message means. I know the request itself is good as I have tested it from a gmail account and it has worked fine. Thanks for any help!

From: aviva@ocens.net
To: gribauto@zygrib.org
Subject: gribauto
Date: Tue, 28 Apr 2015 19:35:47 -0400
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"; format=flowed
Content-Transfer-Encoding: 7bit

login: aviva1
code: ****
area: 30N70W 900NM
resol: 1
days: 8
hours: 6
waves: WW3-GLOBAL
meteo: GFS
WIND PRESS CLOUD GUST TEMP PRECIP
WVSIG WVMAX WVSWEL WVWIND WVPRIM WVSCDY

Thanks!
Dorothy Mammen