@, NoLocalPart
@example.com, NoLocalPart
abc@, NoDomainPart
abc, NoSignAt
abc@def@example.com, TooAt
.abc@example.com, LocalStartPeriod
abc.@example.com, LocalEndPeriod
abc@.example.com, DomainStartPeriod
abc@example.com., DomainEndPeriod
ab..cd@example.com, ConsecutivePeriod
abc@example..com, ConsecutivePeriod
a@example, NoPeriodDomain
ab\c@example.com, WrongCharLocal('\\')
"ab""c""def@example.com", WrongCharLocal('"')
abc def@example.com, WrongCharLocal(' ')
(comment)abc@example.com, WrongCharLocal('(')
abc@[255.255.255.255], WrongCharDomain('[')
abc@(example.com, WrongCharDomain('(')
abc@x.y_y.z, WrongCharDomain('_')
abc@-example.com, WrongStartLabel('-')
abc@example-.com, WrongEndLabel('-')
abc@x.-y.z, WrongStartLabel('-')
abc@x.y-.z, WrongEndLabel('-')
abcd€f@example.com, NoAscii(AsciiError { ch: '€' })
abc@exámple.com, NoAscii(AsciiError { ch: 'á' } )