How to Resolve SMTP Error Code in Yahoo Mail?
Yahoo user faces some uncertain Error while receiving and sending mail. These error codes interrupted the working of the user for which he has to seek instant Yahoo Support Number at contact-customer-service.com. Here are some frequent SMTP Error codes in Yahoo Mail.
Frequent SMTP Error Code in Yahoo Email
Error 421- message temporarily deferred.
Error 421 4 7 0 - will show temporarily deferred due to user complaints.
Error 421 4 7 1 - will permanently be deferred. Retrying will NOT succeed.
Error 451 - will show Resources temporarily not available or please try again later.
Error 451 VS1 - IP Excessive unknown recipients will possible Open Relay.
Error 451 VS1 - MF Excessive unknown recipients will possible Open Relay.
Error 553 5 7 1 – will show connections not accepted from IP addresses.
Error 554 - will show the message not allowed.
Error 554 5 7 9 - will shows message not accepted for policy reasons.
These are Common SMTP Error Code in Yahoo Email if you are facing any then for instant technical support.
Visit for more detail https://www.contact-customer-service.com/yahoo-help
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