SimpleLogin team here, this is actually another error due to the bounce email (note the <>). Do you remember where you created this alias? Would be great if you can send us details to hi@simplelogin.io or open up an issue on Github. Thanks!
I’ll take care of it tomorrow morning. What do you mean by “where” though... I have two aliases setup, one I’ve defined myself and another randomly generated. I’ve provided them the first.