[Class] MX [Function] Defines the start of a zone or a subzone; subordinate records inherit parameters [Typical RDATA] A 16 bit preference value (lower is better) followed by a host name willing to act as a mail exchange for the owner domain. [RR Name] 
Mail exchanger
S t a r t O f A u t h o r i t y
A d d r e s s I P v 4
A d d r e s s I P v 6
" P o i n t e r "
C a n o n i c a l n a m e
N a m e s e r v e r
M a i l e x c h a n g e r