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7.3. Purge DNS Cache
Flushing the DNS cache at some of the largest DNS providers is a good way to try to see very recent changes to DNS records. Maybe hosting or email service was changed. Flushing the DNS cache could help resolve to the new settings faster. You may also have to try to flush on your local machine.
How to Flush DNS Cache on PC, MAC, iOS and Chrome
https://dnschecker.org/flush-dns.php
Google's Flush Cache Tool
https://developers.google.com/speed/public-dns/cache
Cloudflare's Flush Cache Tool
OpenDNS PublicDNS
https://cachecheck.opendns.com/