The relentless onslaught of spam continues to drive mail administrators up the proverbial wall. DMARC, the unofficial successor to SPF (Sender Policy Framework), holds the promise of more email legitimacy, but can it deliver? Here is how you can put DMARC to the test.
A quick guide to a solid DNS configuration using AWS Route 53 (and how to configure DNS using any other DNS service)
The most difficult thing about configuring the DNS settings for a domain is designing a plan of action: making up one’s mind about what kind of services you envision and how you want to route the traffic. Here’s a primer on how to configure DNS using Route 53 or any other service.
Fixing DNS: why you need a Trusted Recursive Resolver and DNS over HTTPS
The DNS system is broken. The sorry state of DNS security exposes your server and your end users to a variety of risks. Some of those risks are preventable.
How to set up a mail server on AWS EC2 using open source software
When running your own mail server you have complete control over its performance and reliability. Here is how to get started with an open-source mail server on AWS EC2.
Quick Tip: Flush the DNS Resolver Cache on Your Computer when Changing DNS Configuration
When migrating a web service or adjusting DNS settings you may come across unexpected behavior of your site long after all errors have been fixed (or so you thought before hitting the Reload button). The hard reality is that in their quest for speed, web browsers try not to make new DNS requests they deem unnecessary. The result is much screaming&steaming from administrators who are in the middle of a job.