I think example.com runs a generic mail server that will accept any login - at least when I was playing around with implementing something like that, my naive t

I think example.com runs a generic mail server that will accept any login - at least when I was playing around with implementing something like that, my naive test account @example.com found settings and got added successfully to multiple mail clients. Obviously no mail will ever arrive there, but it might be a good workaround for this.