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email error 530 5.7.1 Client was not authenticated

could you please explain me what is this error?

which side is the problem?

-------- Mensaje original --------
Asunto:      Returned mail: see transcript for details
Fecha:      Wed, 7 Sep 2011 23:50:41 GMT
De:      Mail Delivery Subsystem <MAILER-DAEMON@imbhub-ru15.nam.nsroot.net>
Para:      <rnunez@notariouno.com.mx>

The original message was received at Wed, 7 Sep 2011 23:49:32 GMT
from imbdmz-ru09.namdmz.dmzroot.net []

# d: error-header.nohash,v 1.1 2003/12/11 09:32:08 as82064 Exp

This an automated message from the E-mail System at Citigroup.

We had a problem trying to deliver the mail you sent.

If you do not understand the error message below, or
need assistance diagnosing the problem, please contact your
local technology support or Helpdesk area.

If you believe the problem is on the Citigroup email system, please
contact the recipient at Citigroup by other means and request that they
open a trouble call with their Helpdesk.

   ----- The following addresses had permanent fatal errors -----
    (reason: 530 5.7.1 Client was not authenticated)

   ----- Transcript of session follows -----
451 4.4.1 reply: read error from []
... while talking to []:
>>> MAIL From:<rnunez@notariouno.com.mx> SIZE=31787
<<< 530 5.7.1 Client was not authenticated
554 5.0.0 Service unavailable
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1 Solution
Problem is on your side, and will most likely be fixed by adding an SPF record into DNS for notariouno.com.mx

The record should look like the following:

"v=spf1 ip4: ip4: ~all"

Open in new window

replace and with the IP's of any servers that are sending mail from notariouno.com.mx.  If you only have 1 server then just use 1 ip4 mechanism, 2 servers use 2 ip4 mechanisms, etc.
@alcani were you able to make this change and test it out?
alcaniAuthor Commented:
Well this a shared hosting (dreamhost), I was understanding the error.

I don't have access to the configuration files...

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