efa-project.org

Receiving this message when a user from a domain that ends in .ws sends us email.

2018-10-26T13:46:50-04:00 failed to deliver: 554 5.7.1 <*****@****summit.ws>: Sender address rejected: US senders only

What can I do to remedy this issue within the shell?

That is postfix...that doesn't look like a default eFa setting.

Which log file on which machine did you pull that message from?