[Postfix-es] SPF record

[Jose perez]

Hola.
Si chequeo con dnsreport los datos de mi domino obtengo este warn.

Your domain does not have an SPF record. This means that spammers can easily send out E-mail that looks like it came from your domain, which can make your domain look bad (if the recipient thinks you really sent it), and can cost you money (when people complain to you, rather than the spammer). You may want to add an SPF record ASAP, as 01 Oct 2004 was the target date for domains to have SPF records in place (Hotmail, for example, started checking SPF records on 01 Oct 2004). 

Mi pregunta es. Que es exactamente esto ?.Es conveniente hacerlo ?. Es facil ?. Algun ejemplo ? Tendre problemas ?

Muchas gracias.
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