What Is: 521 5.2.1 AOL will not accept delivery of this message

If you’ve ever sent an email to someone with an AOL email address, you may have gotten a bounce-back message with the error code 521 5.2.1. This error indicates that the AOL email account is no longer active. Here’s what you need to know about the AOL 521 5.2.1 error and how to fix it.

What is 521 521 AOL?

521 521 AOL is an error message that indicates that AOL is unable to deliver the message. This can be due to a number of reasons, including the message being blocked by AOL or the message being sent to an invalid AOL address. If you are receiving this error message, you will need to contact the sender of the message to resolve the issue.

How can this error be fixed?

The error 521 5.2.1 AOL will not accept delivery of this message can be fixed by contacting the AOL support team and asking them to unblock the email address that is being used to send the message.

What are the implications of this error?

The implications of this error are that AOL will not accept delivery of the message. This could be due to a number of reasons, such as the message being considered spam, the message being too large, or the message containing certain types of content that AOL does not allow.

What Is: 521 5.2.1 AOL will not accept delivery of this message

Must Read

-AOL will not accept delivery of messages that are considered to be spam. If you think that your message may be considered spam, make sure to check AOL’s guidelines on what constitutes spam before trying to send it.

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-Make sure that your message is addressed to a valid AOL email address. If you’re unsure of the address, try doing a search for the person or business you’re trying to email to see if you can find a more updated address.

-If you’re still having trouble, consider contacting AOL directly to see if they can help you troubleshoot the issue.


Thanks for taking the time to read this blog post! I hope you found it informative. AOL is a great company with a long history of providing excellent service to its customers. However, AOL is not without its problems. One of these is that AOL sometimes has difficulty accepting delivery of certain messages. This can be a frustrating experience for AOL customers, but thankfully there are ways to work around it. Thanks again for reading!

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