Debian Tutorials

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Debian Tutorials

Step by step tutorials showing you how to install and configure various applications and services on Debian based Linux distros.


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Implementing SPF checks in Postfix

Sender Policy Framework (SPF), as defined in RFC 4408, is an e-mail validation system designed to prevent e-mail spam by addressing a common vulnerability, source address spoofing. SPF allows administrators to specify which hosts are allowed to send e-mail from a given domain by creating a specific DNS SPF record in the public DNS. Mail [...]

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