Do you know the reason for seeing error code 521 while using AT&T mail? The reason why I’m asking about this error is simply because many people who are using AT&T mail are experiencing this error. This error occurs because of the inability of the email server to send emails. People will get a non-delivery support in which this code will be mentioned. This will also indicate that a particular mailing system has been blocked.

The reason why it is blocked is simply because it has shown consistent behaviour of being spammed or sending spam content. Not just spamming, but a various number of network related abuse as well. So, when such behaviour is noted by the SBC Yahoo Login system, or by other reputed monitors of network activity. Sometimes, both platforms blocks such email servers. So, people who are not being able to send emails to anyone can check whether their IP address is not misidentified.

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There could be a chance that the system has put their IP addresses as the source of spamming other email servers or banned because of objectionable behaviour. If you are facing the same issue, i.e., your IP address is banned, then you need to take the following steps, but make sure you have opened SBCGlobal email settings :

  1. You need to go to third party source websites. If you want to know which websites I’m talking about, then the ones, which can make you identify whether your IP address is blocked or not. You will be able to find out and hence, rectify the solution. If your IP address is on the list of either of sites, then you will follow the directions that are given over there in order request for removal of the IP.
  2. You can also go to the official site of the company in order to remove your IP address from the list of blacklisted sites. Here is the website link:

You have to keep in mind that the processes that you want to perform in order to request for removal has to be completed by the system admins and not by the individual experts. You will have to add some information in order to complete the process. The information is only known by the administrators of the SBCGlobal email.

If you are facing this ‘blocked email’ issue for past many days, then you will have to get in touch with the official site of the company, i.e., AT&T Net email login. You can reach the admin through postmaster address, which is something like this, If you are not able to fix the issue, then you will have to get in touch with email experts who know each and everything about emails and the problems befalling in them.