Yahoo is a well-known search engine that is used by millions of people all over the world. It was founded in 1994 and it is based in Sunnyvale, California.
Yahoo is known for being one of the oldest internet companies that are still active. The company was established in 1995 and was founded by Jerry Yang and David Filo.
The main purpose of Yahoo was to create a directory that would contain information about the internet. However, today, Yahoo has evolved into being a web portal where you can access information about different products and services on the internet.
It also offers other features such as news, mail, finance, sports, and other features that are useful to its users.
On this page, you will find more information about the most common causes and most relevant solutions for the Yahoo! Mail error '421 4.7.0 [TS01]'. Do you need help straight away? Visit our support page.
The Yahoo! documentation indicates that error code '421 4.7.0 [TS01]' is caused by the following problem: "Yahoo Mail is seeing unusual traffic patterns from your server.".
Do you think there is another cause for this error? Let others know in the comments.
If you encounter issues with your Yahoo account or if you encounter errors while using your email account on Yahoo, then you might encounter error code 421-4-7-0-ts01 on your device’s screen.
To fix this error, you need to try a few solutions.
Solution 1: Check whether your IP address is on Yahoo's blacklist
You can fix this error by checking whether your IP address is on Yahoo’s blacklist. You can find out if your IP address is on the blacklist by checking the Status page of your Yahoo account.
If you are on the blacklist, then you will be unable to use your Yahoo account.
To check if your IP address is on the blacklist, follow these steps:
Log in to your Yahoo account and click on the Status link under the Settings section. Then, you will be able to see if your IP address is blacklisted or not.
To fix this, reverse your DNS resolves to a hostname that is not on the blacklist.
Solution 2: Request removal from Spamhaus
If your IP address is deemed as spam, Spamhaus will have it on the list. Since Yahoo uses Spamhaus, it might affect your Yahoo account as well. To fix this, request removal from Spamhaus.
To remove your IP address from Spamhaus, follow these steps:
Log in to your Yahoo account and click on the Settings link under the Account section. Then, you will be able to see a link that says Remove From Spamhaus.
Click on this link and a pop-up window will appear. In this window, click on Submit and then wait for the email confirmation. Once you receive the email confirmation, you can check if your IP address is still on Spamhaus or not.
If these solutions don't fix your problem, consider contacting Yahoo customer support.