Monday, July 20, 2020

DNS Utilities

IntoDNS runs an analysis on multiple aspects of your DNS, and tells you what isn't working.
https://intodns.com

MXToolbox will help you get your email records (SPF, DMARC and DKIM) straightened out, and offers a free weekly summary of your mail DNS health.
https://mxtoolbox.com

Google Postmaster tools can help you troubleshoot issues with sending mail to Google.
https://www.gmail.com/postmaster/

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Basic Principles of Frequency Modulation (1944)

War Department video on why the military needs FM instead of AM. https://www.youtube.com/watch?v=AzvxefRDT84

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