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Implications of DNS SPF

Discussion in 'Networks' started by Tegal, Jul 4, 2007.

  1. Tegal

    Tegal Bit Poster

    Anyone out there familiar with SPF?

    I understand the concept and even the execution for the most part. But what about this.

    I have an exchange server and DNS is configured to deliver email direct to the server, and the SPF record is set to allow any A/MX record as a sending server. That's fine for all staff at the office where the sending server is.

    However I have users in a different country who connect via POP3 and download their email from our server but who send email through their local ISP but from our domain name.

    ie [email protected] is sending email through his local ISP smtp.localisp.com not through smtp.example.com

    When the receiving mailserver checks the SPF for example.com surely it'll be obvious that the email was sent from localisp.com not example.com and make it a possibile spam email?

    Or am I missing something?

    Certifications: BEng, MCP

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