Delay mails

 dsn=4.3.0, stat=Deferred: 451-Sender host (41.78.83.238) not yet authorized to deliver from 451-<neagada@frcnigeria.gov.ng> to <olumide.adeboyejo@procentriciq.com>. Please 451 try again later.

Hello Team,

Help someone should explain what this error means.

Regards,

Firdausi