My JVC camcorders record in MOD and TOD file formats, which are non-standard video formats that cannot be directly played on most computers or networked media players. This post describes how to use the Linux ‘find’ command to create an…
Read more → Multiple monitors allow Puppet infrastructure, role, manifests and data files to be viewed side-by-side with different shell windows and file managers. Given the large number of Puppet files and systems, it is incredibly convenient to arrange different windows across multiple…
Read more → Puppet environments such as development, testing and production can be logically organized on different desktops to simplify system configuration management. Environments provide a safe way to develop Puppet-controlled systems. I organize the Puppet development cycle into three such environments: development,…
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What is the difference between the different XE700T1C models, besides their price? The Samsung website and online support was no help. In December 2012 I replaced my Motion LE1600 tablet with the Samsung XE700T1C ATIV smart PC. Samsung offered four…
Read more → I received a spam email that asked me to open an attached file, preferably “open with Internet Explorer,” it said. Of course I can not resist, but I opened the file with a text editor. (You should never open suspicious…
Read more → DMARC reports arrive in xml format. To view the reports in a human readable form, I use the website dmarcian.com. Here is an example for my jaroker.com domain:
Read more → dig Quick way to get DNS TXT records under Linux is use the dig command: # dig google.com TXT To look up DKIM or DMARC records, you specify the prefix in the domain such as: # dig _dmarc.google.com TXT nslookup…
Read more → The fastest and easiest way to improve email delivery and prevent sender address forgery is to use a DNS TXT record to publish who is allowed to send emails and from which server the emails are allowed to originate. This…
Read more → Sender ID uses ‘spf2′ to identify the DNS TXT record, leading one to believe that Sender ID is version 2 of the SPF framework. It is not. This misnomer denotes a broken framework championed by Microsoft. Precautions need to be…
Read more → Domain-based Message Authentication, Reporting and Conformance (DMARC) establishes operating rules on how to interpret the technical results of DKIM and SPF validation. DMARC was initiated in 2011 to combat phishing attacks. An email sender uses a DNS TXT field to…
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