test
@
test@
test@io
@io
@iana.org
test@iana.org
test@nominet.org.uk
test@about.museum
a@iana.org
test@e.com
test.test@iana.org
.test@iana.org
test.@iana.org
test..iana.org
test_exa-mple.com
test@test@iana.org
123@iana.org
test@123.com
test@data-check.com