Given the MX hosts for sympatico.ca domain: $ dig sympatico.ca mx +short 5 mxmta.sympatico.ca. $ dig mxmta.sympatico.ca +short 67.69.240.17 67.69.240.24 67.69.240.22 67.69.240.23 67.69.240.21 67.69.240.20 67.69.240.19 67.69.240.18 when the peer MTA fail to talk to one of these hosts,will it try the next one? or it just give up? Thanks.