Some Common SMTP Errors In Yahoo Mail

When an error occurs in sending mail, it can be due to several causes. In either case and to make solving the problem easier, the mail applications give an error code and small information. This information will be necessary to locate the problem and solve it. As always, recognizing the problem for which our mail could not be delivered can save us a lot of time. Therefore, we have set up a list with the most popular SMTP errors when sending emails to make it easier to correct the errors:

Common SMTP Errors

The message content included offensive content, we're seeing unusual traffic from your servers, or emails from your mail server are creating complaints from Yahoo Mail users.

This error means Yahoo is seeing unusual traffic from your IP address and/or that emails from your mail server are creating complaints from Yahoo Mail users.
It Means Yahoo detecting unusual traffic patterns from your server or your mailings are creating complaints from Yahoo Mail users. 

Yahoo is noticing a high volume of e-mails from your server that are characteristic of unsolicited mailings. 


This error means that Yahoo servers were busy and temporarily incapable to process your transaction at the time of connection.

  • 451 VS1-IP Excessive unknown recipients - possible Open Relay (#4.1.8)
The server identified an attempt to send an SMTP command but the parameters contained at least one syntax error. 

  • 451 VS1-MF Excessive unknown recipients - possible Open Relay (#4.4.5)
This code means the sender's MAIL FROM address has been sending to extreme bouncing accounts (non-active, don't exist). 

The sending IP is listed on a blacklist. You can verify your status on the Spamhaus site.

Your emails have converted deprioritized due to the message content triggering our Yahoo filters. 

The Yahoo account that you're attempting to send to doesn't exist. 

Your message wasn't delivered because Yahoo was unable to confirm that it came from a valid email sender.


Important Tags
How to Fix Yahoo SMTP Error Codes
How To Contact Yahoo For SMPT Errors
Yahoo Customer Service Support For SMPT Codes Error 

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