Email Fix Pack

Email bounce error and setup guides

Step-by-step fixes, checked against official documentation.

• Fix Gmail error 550 5.7.26: sender is unauthenticated
• Fix Gmail error 421 4.7.28: unusual rate of email
• Fix Outlook error 550 5.7.515: required authentication level
• How to set up DMARC for Google Workspace
• How to set up DMARC for Microsoft 365
• Fix SPF permerror: too many DNS lookups
• How to add a DMARC record in GoDaddy
• How to add a DMARC record in Cloudflare
• How to add a DMARC record in Namecheap
• How to set up DKIM in Google Workspace
• How to set up DKIM in Microsoft 365
• SPF for multiple email providers: one merged record

Check your domain free

Sources: Google, Microsoft, RFC 7208.