Securing Your Postfix Mail Server with Greylisting, SPF, DKIM and DMARC and TLS

”Domain-based Message Authentication, Reporting & Conformance” (DMARC). DMARC basically builds on top of two existing frameworks, Sender Policy Framework (SPF), and DomainKeys Identified Mail (DKIM). SPF is used to define who can send mail for a specific domain, while DKIM signs the message. Both of these are pretty useful on their own, and reduce incoming […]

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Postfix Implement SPF Record Checking

So I’ve been dealing with quite a bit of spam recently, the usual “You’re due a tax rebate open XYZ.zip and fill out the form”, etc. Following from my last blog post, Postfix Force SMTP Authentication, I noticed I never setup my mail server to check received mail against the senders SPF records, which I […]

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