Sendmail...!!!

"Jose Medrano" <[email protected]>
Newsgroups gmane.org.user-groups.linux.gulcr
Message-ID <[email protected]>
Estimados señores,
Disculpen la molestia, queria hacerles una consulta, para saber si ustedes 
han tenido contacto con sendmail?

Espero que si, es que tengo un problema con un servidor que posee sendmail 
8.13.6 y algunos dominios, basicamente es que el sendmail no recibe MAIL 
FROM nulos. Hay dominios que validan al servidor mediante un MAIL FROM: <>.

Al realizar un estudio en dnsreport me doy cuenta que este servidor no 
acepta "Acceptance of NULL <> sender"

¿Alguien conoce la forma de deshabilitar esta opción y permitir los MAIL 
FROM:<>?

EL error que estoy recibiendo es:

220-server.com ESMTP Exim 4.63 #1 Fri, 19 Jan 2007 07:52:15 -0600
220-We do not authorize the use of this system to transport unsolicited,
220 and/or bulk e-mail.
lo
250 server.com Hello  [196.40.66.177]
mail from:[email protected] OK
rcpt to:[email protected] 550-Callback setup failed while verifying 
<[email protected]>
550-(result of an earlier callout reused).
550-The initial connection, or a HELO or MAIL FROM:<> command was
550-rejected. Refusing MAIL FROM:<> does not help fight spam, disregards
550-RFC requirements, and stops you from receiving standard bounce
550-messages. This host does not accept mail from domains whose servers
550-refuse bounces.
550 Sender verify failed

Agradezco toda la ayuda que me puedas brindar.

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