sounds like you are not configured to listen on the external interface, If this is sendmail then it defaults to local only and will need to have a line changed in the sendmail.cf file
this line is the default... local only
DaemonPortOptions=Port=smtp,Addr=127.0.0.1, Name=MTA
you can either delete it or change the .mc file from
DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')
to this
dnl DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')
and rebuild sendmail.cf.
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