Active Role Synchronization for GAL entries


I'm hoping someone can provide any information or experience on syncing a GAL between two Exchange environments.

Right now I am just creating a contact in the target domain using a user account info from the source and giving the contact the target address of the source domain account. I create the contact but still need to run a script on the target side to mail-enable the contact. Has anyone ever used the sync between two Exchange environments to create a mail contact that is mail enabled? Or anyone know a easy way to sync the GAL?

I've mostly worked with the domain sync between two domains. I just need to sync one way for the GAL to have entries from the Source domain to the Target.

FYI: I'm not an Exchange Admin and inexperienced with Exchange side of the house.

Thanks for any advice or guidance in advanced.

Thank you,