Error 550 Unable to relay

[DesertRose]

Help! I am having problems with two of my domains, both hosted by the same company. Needing to know if it's them or me... All of a sudden, I'm not receiving emails, so I start doing some tests and I get this email from "postmaster". Any suggestions?
Note- the two hosted by the same company are crystina.net and eternalrose.com. This error note happened when I sent a test from another account to eternalrose and crystina.net

=======================================
This is a collection of reports about email delivery
process concerning a message you originated.

Some explanations/translations for these reports
can be found at:
http://zmailer.org/delivery-report-decoding.html

If you are our customer, further help is available
at email address: ____ @ ______ (TO BE FILLED IN)
Reporting-MTA: dns; ams004.ftl.affinity.com
Return-Path: <crystina@desertrosedesign.net>
Arrival-Date: Mon, 3 Apr 2006 21:32:25 -0400
Local-Spool-ID: S518061AbWDDBcZ


FAILED:
Arrived Recipient:
rfc822;postmaster@ams008.ftl.affinity.com
Original Recipient:
rfc822;postmaster@ams008.ftl.affinity.com
Final Recipient:
RFC822;postmaster@ams008.ftl.affinity.com
Status:
5.7.1
Remote MTA:
dns; corpsmtp.affinity.com (216.219.250.38|25|172.31.5.108|48784)
Last Attempt Date:
Mon, 3 Apr 2006 21:32:26 -0400
X-ZTAID:
smtp[7461]
Diagnostic Code:
smtp; 550 (Unable to relay for postmaster@ams008.ftl.affinity.com)
Control data:
smtp ams008.ftl.affinity.com postmaster@ams008.ftl.affinity.com 99
Diagnostic texts:
<<- MAIL From:<crystina@desertrosedesign.net> SIZE=4370
->> 250 2.1.0 crystina@desertrosedesign.net....Sender OK
<<- RCPT To:<postmaster@ams008.ftl.affinity.com> NOTIFY=FAILURE,DELAY ORCPT=rfc822;postmaster@ams008.ftl.affinity.com
->> 550 5.7.1 Unable to relay for postmaster@ams008.ftl.affinity.com

Following is a copy of MESSAGE/DELIVERY-STATUS format section below.
It is copied here in case your email client is unable to show it to you.
The information here below is in Internet Standard format designed to
assist automatic, and accurate presentation and usage of said information.
In case you need human assistance from the Postmaster(s) of the system which
sent you this report, please include this information in your question!

Virtually Yours,
Automatic Email Delivery Software

Reporting-MTA: dns; ams004.ftl.affinity.com
Arrival-Date: Mon, 3 Apr 2006 21:32:25 -0400
Local-Spool-ID: S518061AbWDDBcZ

Original-Recipient: rfc822;postmaster@ams008.ftl.affinity.com
Final-Recipient: RFC822;postmaster@ams008.ftl.affinity.com
Action: failed
Status: 5.7.1
Remote-MTA: dns; corpsmtp.affinity.com (216.219.250.38|25|172.31.5.108|48784)
Last-Attempt-Date: Mon, 3 Apr 2006 21:32:26 -0400
Diagnostic-Code: smtp; 550 (Unable to relay for postmaster@ams008.ftl.affinity.com)


Following is copy of the message headers. Original message content may
be in subsequent parts of this MESSAGE/DELIVERY-STATUS structure.

Received: from [68.214.102.65] ([68.214.102.65]:9668 "HELO crystina")
by ams004.ftl.affinity.com with SMTP id S518061AbWDDBcZ;
Mon, 3 Apr 2006 21:32:25 -0400
Message-ID: <007501c65787$a12d2650$6101a8c0@crystina>
From: "Desert Rose Design" <crystina@desertrosedesign.net>
To: "The Post Office" <postmaster@ams008.ftl.affinity.com>
References: <S602236AbWDDBau/20060404013050Z+63826@ams008.ftl.affinity.com>
Subject: Re: Returned mail: see the transcript [FAILED(1)]
Date: Mon, 3 Apr 2006 21:32:25 -0400
MIME-Version: 1.0
Content-Type: text/plain;
format=flowed;
charset="iso-8859-1";
reply-type=original
Content-Transfer-Encoding: 7bit
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook Express 6.00.2900.2527
Disposition-Notification-To: "Desert Rose Design" <crystina@desertrosedesign.net>
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527

[ILoveHostasaurus]

I believe that problem is an incorrect setting for the mail server in your store's config. You'll find the mail server under Domain Settings -> Site Configuration. On most hosts it is localhost, but I think affinity.com is Valueweb, and I believe they have a special value that it should be set to such as miva.valueweb.com or something along those lines. I don't think localhost will work and setting it to mail.desertrosedesign.net also probably will not work. You'll need to check with them for the appropriate value.

[ILoveHostasaurus]

Oh, I just realized you are talking about your own sending of email and not Miva Merchant right? That's going to be more difficult, it is likely a problem only they will be able to resolve if there's something wrong internal to their mail server for your domains.

[DesertRose]

Yep. I've had nothing but positive things to say about ValueWeb. M@pn@me.com (identity hidden to protect the scumbags) is another story. I was doing fine and had several of my clients hosted with them until they started deciding not to honor my referrals, etc. I very politely asked them to correct the situation. They didn't. I pulled one by one and had my clients switched over to another new host. Working very well. However, these two domains weren't transfered yet. Apparently M@pn@me got their "pink slip" from a few licensing agencies and all of a sudden I have no email. Coincidence? I think not.

I have tried to switch my nameservers, etc to no avail. Is there any way to "steal it back"? I've had no luck with my requests.