need to sync windows ldap to external 3rd party provider

Hi, I'm setting up a 3rd party spam filter (offsite) and there is an option to sync the users via ldap.
They have given me there public ip address. with which I will open the relivant port and only allow this IP to use it.
What I don't know is what port I need to open and what I need to do on the windows 2008 AD to make an external sync work

the server is windows 2011 sbs
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total123Asked:
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Adam BrownSr Solutions ArchitectCommented:
LDAP runs on port 389. You shouldn't have to do anything on your AD to make it work unless you want to encrypt the traffic (Highly recommended). I would also recommend that you install an ADLDS instance on another server that syncs with your AD and open up *that* to the Internet. This will ensure that only the necessary information (usernames and email addresses) are shared with your partner.
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total123Author Commented:
I've setup ADLDS as suggested, thankyou for the idea.
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Windows Server 2008

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