When I send email to an AOL account this morning, I receive the following error:

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This message was created automatically by mail delivery software. 
A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. 

<........ @aol.com> , ERROR_CODE :553, ERROR_CODE :5.7.2 [TSS09] All messages from 136.143.188.10 will be permanently deferred; Retrying will NOT succeed. See  https://help.yahoo.com/kb/postmaster/SLN3436.html  

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The Yahoo article says that I have been bulk emailing and should stop sending so much email!

I have key business contacts that use AOL account so I must be able to send email to them.

Thanks!