We’ve added a new client validity check option called “Allow sender address to fail an RFC822 Address Check”. This option stemmed from an old feature request.
However, we are not supporting changing this option away from its’s “default” setting. The purpose of adding it as an option is to let customers that know why they would want to bypass this check (and understand the possible pitfalls) to have the option to do so. Rollernet does not recommend or support changing this setting. You’ll find it at the very bottom of the Client Validity Checks.