I use a amex@whatever.com & walgreens@whatever.com email for both amex and walgreens? I've run into 2, old-ish institutions that didn't quite work with my what

I use a amex@whatever.com & walgreens@whatever.com email for both amex and walgreens? I've run into 2, old-ish institutions that didn't quite work with my whatever@whatever.com and had to modify it slightly for them.