Connected: An Internet Encyclopedia
RFC 1035 - 3.3.3. MB RDATA format (EXPERIMENTAL)
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3.3.3. MB RDATA format (EXPERIMENTAL)

    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
    /                   MADNAME                     /
    /                                               /
    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+

where: 

MADNAME         A <domain-name> which specifies a host which has the
                specified mailbox.

MB records cause additional section processing which looks up an A type RRs corresponding to MADNAME.

Next: 3.3.4. MD RDATA format (Obsolete)
Connected: An Internet Encyclopedia
RFC 1035 - 3.3.3. MB RDATA format (EXPERIMENTAL)