28/03/2015 - UPDATE- Steve Jenkins has created a more up-to-date version of this post which is definitely worth checking out if you are looking into deploying OpenDMARC. 240159153130 A few months ago, while trying to debug some SPF problems, I came across ""Domain-based Message Authentication, Reporting & Conformance" (DMARC). DMARC basically builds on top of two existing Continue reading Securing Your Postfix Mail Server with Greylisting, SPF, DKIM and DMARC and TLS
In this article we will discuss how to configure postfix so that it logs mail's subject in the maillog (/var/log/maillog)
Postfix consists of numerous services, commandos and queues. The documentation describes them in detail, but a general overview was missing - so I gave it a try. The Postfix documentation is very detailed and of high quality. One example is postfix.org/OVERVIEW.html which explains the various services, queues and commandos and how they interact with each
SSL (Secure Sockets Layer) and its descendant TLS (Transport Layer Security) are the most widely used protocols for encrypting data that is exchanged between a server and a client. These protocols often use X.509 certificates and asymmetric cryptography. STARTTTLS is another method of securing plain-text communication. This protocol also encrypts data with SSL or TLS, Continue reading...
Update to my last post about email setup As a remote worker, I travel frequently, and often work away from my home office. My workhorse computer is my laptop, which has most of my important data. Unfortunately, I'm not always near a working open wifi, and that happens frequently in my hometown, which is not Continue reading Best in show. ...
When we send an email through our Postfix mail server, by default, Postfix adds a Received: header with the IP address of the computer where the email is sent from. We may want to hide this information to the email recipient's and the intermediate SMTP servers so the sender can not be tracked.
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