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Here's how to test if a mail server supports TLS using a windows pc: nslookup> set q=mx> google.comThe results:google.com   MX preference = 100, mail exchanger = google.com.s9a1.psmtp.comgoogle.com   MX preference = 300, mail exchanger = google.com.s9b1.psmtp.comgoogle.com   MX preference = 200, mail exchanger = google.com.s9a2.psmtp.comgoogle.com   MX preference = 400, mail exchanger = google.com.s9b2.psmtp.com> exittelnet google.com.s9a1.psmtp.com 25After connected type:ehlo google.comIf … Continue reading Test Mail Server for Inbound TLS →

If you’ve spent any amount of time in the tech field you’ve probably heard of the “Nines of Availability”. Availability is usually expressed as a percentage of uptime in a given year. The following table shows the downtime that will be allowed for a particular percentage of availability, presuming that the system is required to … Continue reading Understanding the “Nines of Availability” →