hotmail send bare LF

Hi, it seems, that hotmail send a bare LF in the added signature (and violates RFC). qmail drops the connection afterwards: 451 See http://pobox.com/~djb/docs/smtplf.html no helpfull response from hotmail: https://windowslivehelp.com/community/t/121824.aspx Kind regards, Ingo Flaschberger