Even worse I've had front end systems accept account creation with this address format, but their backend system fails when using some integrated service. The r

Even worse I've had front end systems accept account creation with this address format, but their backend system fails when using some integrated service. The result is 3 months after setting up the account something breaks when I try some other functionality and I have had to contact their help desk and ultimately we stumble through and realize the problem may be my email address.