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Playing with SPF

Have you ever received spam that was coming from yourself or someone else from the same domain name? Well, I did. It seems to be a new trend that spam or viruses are coming from someone with almost the same email address you use.

But why is that? The answer is simple: whitelisting. When you filter spam coming to your inbox, it can be a common practice to whitelist your email address or the domain of your organisation so that it is never non-intentionally considered spam. This is good while working with Bayesian filters and the like.

So what is the solution to this common problem? Well, it is quite simple and it is called SPF, or Sender Policy Framework. Basically, what a sysadmin does is publishing a SPF record about which server should send mail for his domain.

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