While launching a site migrated from Magento 1 you are instructed to change the website CNAMErecord in your DNS provider by Magento for go live
What is the purpose of setting this record9
Setting this record causes sent email to be property authenticated and not show in junk folders
Setting this record enables the page caching service for your site
Setting this record is needed on Pro to allow upsizing servers without downtime
Setting this record reduces the time it takes for customers to start seeing your Magento 2 site
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