Fix Yahoo Mail 5xx SMTP error codes

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Fix Yahoo Mail 5xx SMTP error codes

• 5xx SMTP errors indicate an email could not be
  delivered due to a permanent problem. You should
  not retry sending email flagged with a 5xx error.
  Message delivery can be permanently deferred
  because

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• You're trying to send a message to an invalid
  email address.
• Spamhaus has your IP address listed on a Block
  List.
• Your SMTP connection was rejected.
• Your message failed authentication checks against
  your sending domain's DomainKeys or DKIM policy.
• The message contains characteristics that Yahoo
  Mail won't accept for policy reasons.

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Fix Yahoo mail 5xx SMTP Error

• Check The Email ID Address where you send the
  email.
• Check Your SMTP Connection is properly connected.
• Read the yahoo message contains characteristics
  policy and follow the characteristics for policy.
• Fix If your internet Address has blocked or
  blacklisted.

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• These are the steps you will follow. If you can
  not read the problem, you should contact the
  Yahoo Mail support number. 24 7 specialized
  technicians are available to solve all your
  problems. You can simply take the help of experts
  and technicians.