AOL emails can't be sent from the server

When sending email I get

SMTP error from remote mail server after end of data: host mailin-01.mx.aol.com [205.188.158.121]: 421-: (DNS:NR) http://postmaster.info.aol.com/errors/421dnsnr.html\n421 SERVICE NOT AVAILABLE


To fix this you need to ask us to setup RDNS for your main IP address.

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