5.3.0 - Other mail system problem 521-5.2.1

Good day I ask for your support to verify what the problem is when I try to send an email to the following email address kerrmarine@aol.com since neither is eguerrero@nexxuscapital.com, sends me the following error

The Following message to <kerrmarine@aol.com> was undeliverable.
The reason for the problem:
5.3.0 - Other mail system problem 521 - '5 .2.1: (CON: B1) http://postmaster.info.aol.com/errors/554conb1.html '

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