weird MX behavior

[dns-admin]

hi,

i'm running "bind-chroot-9.2.4-16.EL4" on "CentOS release 4.4 (Final)".

this config works fine ...
######################################################################
$TTL 86400
@               IN      SOA     ns1.mydomain.com.
dns-admin.mydomain.com. (
                                        2006100201      ; Serial
                                        3600                 ; Refresh
                                        600                   ; Retry
                                        1209600            ; Expire
                                        3600 )               ; Minimum

                IN      NS      ns1.mydomain.com.
                IN      NS      ns2.mydomain.com.

funny            300     IN      A       10.10.10.10
www.funny    300     IN      A       10.10.10.10
@                300     IN      MX      10      mail.boss.com.
@                300     IN      MX      20      mail1.boss.com.
@                300     IN      MX      20      mail2.boss.com.
funny            300     IN      MX      10      mail.boss.com.
funny            300     IN      MX      20      mail1.boss.com.
funny            300     IN      MX      20      mail2.boss.com.
######################################################################
 i changed my config to
######################################################################
$TTL 86400
@               IN      SOA     ns1.mydomain.com.
dns-admin.mydomain.com. (
                                        2006100201      ; Serial
                                        3600                 ; Refresh
                                        600                   ; Retry
                                        1209600            ; Expire
                                        3600 )               ; Minimum

                IN      NS      ns1.mydomain.com.
                IN      NS      ns2.mydomain.com.

funny            300     IN      CNAME   www.hugo.com.
www.funny    300     IN      CNAME   www.hugo.com.
@                300     IN      MX      10      mail.boss.com.
@                300     IN      MX      20      mail1.boss.com.
@                300     IN      MX      20      mail2.boss.com.
funny            300     IN      MX      10      mail.boss.com.
funny            300     IN      MX      20      mail1.boss.com.
funny            300     IN      MX      20      mail2.boss.com.
######################################################################

mailing to funny.mydomain.com doesn't work anymore. i don't get any MX
records for
funny.mydomain.com !

so all i've been doing is that i changed the A record to a CNAME which
i think hasn't got anything to do with mailing - or am i wrong ?

any help would be greatly appreciated

regards
willi grundner