email bounced for container policy reasons

E-mail sent from a Geeklog CMS site is being rejected by a specific domain with the rejection message:

550 5.5.0 Mail rejected for container policy reasons

Any ideas on what this means?

This is apparently a recent change, and the domain's email adminstrator has not responded to my requests for an explanation.

I'm not sending unsolicited mail. This happens when I attempt to communicate with registered users who have previously signed up using email at this domain.

 

 

 

 

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