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Humans have always been keen to evolve irrespective of the fields. Be it transportation or communication, humans have come a long way. Modern-day communications thrive via the internet and radio waves. Mails have become better and efficient since the inception of different online webmail pages that provide state of the art features for moderate prices which can be accessed easily by users all over the globe. One such giant in the email scenario is Yahoo, launched in 1997. 

Yahoo Mail is one of the oldest and prominent mail services that are enjoyed by billions of people around the globe. Yahoo has been on the top of electronic mail services for a while and the majority of that has been made possible by its developers who keep track and provide us with the latest and powerful features. It offers four different email plans, three of which are for general purposes while the other one is strictly for business purposes. But like all things Yahoo also has its fair share of bugs and glitches. Users have mostly criticized Yahoo for its poor accessibility. While talking about the common issues that users went through are technical, common error codes such as Yahoo mail error 14, Yahoo error code 550, and 554 delivery error Yahoo.

One of those errors is the Yahoo mailbox error code 500, more commonly known as the SMTP error.

It is generally encountered by the users when they were trying to send emails from Yahoo.

The emails that are being sent to their respective recipients remain undelivered. It is advised to not forward those emails as it may cause damage to the system’s inbox. This type of problem seems concerning and severe and may cause trouble in the near future if not resolved urgently.

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Given below are a few simple steps that will help you identify, as well as fix the Yahoo error code 550.


  1. All of your emails get spammed.
  2. The error message will continuously pop up on your screen.
  3. You may not be able to access your mail account for a while.
  4. You wouldn’t be able to send any emails or messages to the respective recipients.


  1. The email address entered is incorrect. This is the most common of them all.
  2. The IP address gets blocked which may lead to this error.
  3. The error may occur due to some authentication failure.
  4.  A poor internet connection can also lead to this error.
  5. This error can also occur if the email content is invalid.
  6. Due to an invalid SMTP connection.


  1. Make sure that you have a stable internet connection with a high link up speed. Also, see if your wireless devices are working properly.
  2. In order to fix the error, the user must also be the administrator of the server.
  3. See to it that your email sending reputation is correct and precise.
  4. Check to see whether you have the facility to remove the email addresses or not.
  5. You will also need to fill up a new sender application.
  6. Make sure that you regularly keep track of all the spammers and other elements whether they are causing trouble to your server or not.


This guide should do the troubleshooting for your error. Follow these steps neatly to resolve the “550 Request failed; mailbox unavailable Yahoo” notification whenever it pops up on your screen. If you find it difficult to follow these guidelines or if faced with any other glitches during this process then you may getassist via help and solution.