3 ms·Strictly speaking user@localserver is valid, but would fail test 2.by vinw 12y agoStrictly speaking user@localserver is valid, but would fail test 2._dan 12y agoTrue, but is it something you actually want to accept?vinw 12y agoYes. Or no.drdaeman 12y agoSame for user@{ai,ax,cf,dm,gp,gt,hr,io,kh,km,lk,mq,pa,tt,ua,va,ws,bar,college,host} and probably some other TLDs I didn't bothered to check.