Unable to save this email forwarding rule

For almost 2 months, I try to create an email forwarding rule, and each time, I get the same answer : 

Quote

 

Unable to save this email forwarding rule

There was a problem with saving your changes. Please try again later.

 

I've read the documentation, tryed to understand the mistake on my side, and I do not find any.

Could someone help ?

thanks

any luck with this? i'm having the same issue