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stopped getting emails from client,550 5.1.1 per it's SPF Record

I am not getting emails from my client from last two days, per them they are getting deliver failure with below error message:


Message not delivered
There was a problem delivering your message to "our email id". See the technical details below, or try resending in a few minutes.

 

The response from the remote server was:
550 5.1.1 IP Address is not allowed to send from <their domain name> per it's SPF Record. Please inspect your SPF settings, and try again. IB508 <http://x.co/srbounce>

 

Can someone help what could be the issue, it is really looking bad from my side that he is keep getting delivery failure emails.

 

Pls help

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