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550 <> Sender Rejected - MAILFROM must be a valid domain. Ensure the mailfrom domain: "" has a valid

Hello guys. 

Please can anyone describe why this error occurred?

 

"550 <> Sender Rejected - MAILFROM must be a valid domain. Ensure the mailfrom domain: "" has a valid MX or A record."

 

Almost emails working fine but this error occurred sometime. 

1 REPLY 1
Super User IV

@shunman 

 

It sounds like whatever domain you are "sending" from isn't setup to have a website/landing page or to be abel to receive mail. What is your domain name?

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