!#$%&'*+-/=?^_`{|}~@example.com user+mailbox@example.com customer/department=shipping@example.com $A12345@example.com !def!xyz%abc@example.com _somename@example.com a@example.com a@x.y abc.def@example.com abc-def@example.com 123@example.com xn--abc@example.com abc@x.y.z abc@xyz-example.com abc@c--n.com abc@xn--hxajbheg2az3al.xn--jxalpdlp abc@1example.com abc@x.123