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Sender Policy Framework (SPF)

Discussion in 'Site & Server Administration' started by J.D., Jun 11, 2005.

  1. #1
    All of us hate spam and many wonder what can be done to fight this menace. Here's one thing eveybody can and should do that will make a difference - ensure that your DNS server has a so called SPF record. An SPF record is a resource record (RR) of the type TXT that looks like this (this is just an example):

    v=spf1 ip4:192.168.1.0/24 ip4:192.168.2.0/24 ~all
    SEMrush
    All SPF-compliant SMTP servers will try to obtain the SPF record for the domain that is trying to send mail, which tells the SMTP server that mail from the domain in question may only be sent from the specified addresses. If a spammer tries to forge a domain name, their IP address will not match those listed in the domain owner's DNS.

    If you would like to read more about SPF, here's the link that will answer most questions:

    http://spf.pobox.com/faq.html

    You can check if your current DNS server has an SPF record here (it's at the bottom of the page):

    http://www.dnsreport.com

    Many existing domains, such as hotmail.com, are configured with one or more SPF records.

    Having an SPF record in your DNS will not reduce the amount of spam *you* receive, but rather prevents someone else sending spam using your domain name. It's reciprocal, though - if your SMTP server is SPF-aware, you won't receive spam mail from hotmail (unless it's been sent directly from a hotmail server).

    J.D.
     
    J.D., Jun 11, 2005 IP
    digitalpoint likes this.
    SEMrush
  2. Corey Bryant

    Corey Bryant Texan at Heart

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    #2
    Corey Bryant, Jun 13, 2005 IP
    J.D. likes this.
  3. ResaleBroker

    ResaleBroker Active Member

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    #3
    Great information guys. Thanks! :)
     
    ResaleBroker, Jun 13, 2005 IP