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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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Enable greylisting in Postfix using Postgrey

Greylisting is a new weapon to use against spam in this great war being waged upon it. With this new shielding method, by which you may block out huge amounts of spam, you are sure to please your email clients! In name, as well as operation, greylisting is related to whitelisting and blacklisting. What happen is that each time a given [...]

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