This error may occur for a number of reasons, all of which will be addressed in depth here.

Before you try to fix the problem, you can first figure out what’s causing it. You can do this by reading the list below:

  1. The 504 Http Error AOL mail functions similarly to a gateway timeout. It happens when the two servers in charge of opening a page fail to respond in a timely manner.
  2. When a server request is not responded to by your browser. You could make a mistake.
  3. It is possible for your email address to be deactivated if it has been inactive for more than 90 days.
  4. All such accounts do not receive mail and it is returned to sender, which can also result in an error.
  5. It may also be due to a server snag or a problem with internet access.