: You add a TXT record provided in your Google Admin Console to your domain registrar (like GoDaddy or Namecheap). This often looks like google-site-verification=unique-code Hotmail/Outlook : Similar to Google, Microsoft requires an MS=msXXXXXXXX
: Technologies like SPF, DKIM, and DMARC to ensure the sender is who they claim to be. gmailcom hotmailcom yahoocom txt verified
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