distribution list error for external use

HI, I have the following enviroment
SLES11 SP2
EDirectory 8.7.3
Groupwise 8.0 SP2 HP3

I have created some distribution lists and for internal emails all work ok, but When I want sent email from external direction (hotmail for example) to some distribution fail I receive the mailbox doesn't exist.

I have do ldap browser and verify that all distribution lists haven't mail field.

I can not receive internet mail to distribution groups

Please your help.

Thanks

vanessa
vanessav@it-synergy.net