block internet access while allowing access to google apps

Hi.. i look after a network of about 30 users.  (windows 2012 domain controller and windows 7 pcs) they use google apps for their emails using the outlook connector.  i need to block internet access for about 10 users but i need to allow outlook / google apps to continue to work...any ideas?  i am open to other services!  thanks in advance...
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TemodyPickalbatros, IT ManagerCommented:
You willing need a firewall system
TMG  pfsense Mikrotik
Depending your experience within those system we can help you in creating rules

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linkeastAuthor Commented:
Info have a Sonicwall as well... Not sure how I would use this though.  All my users have dynamic there a way I could block access for specific users while still allowing full access to google apps mail via outlook?
TemodyPickalbatros, IT ManagerCommented:
Yes you can
Create a rule to block some user depending on MAC for them
Create another rule to allow only access to pop3 and IMAP traffic
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linkeastAuthor Commented:
Does google apps sync not use mapi protocol?  Will that still work?
Allen FalconCEO & Pragmatic EvangelistCommented:
Internet access uses ports 80 and 433.  Block these protocols using your firewall for those users by ip range or ad names if supported.

Allow traffic via Pop, IMAP, or if using GASMO, the MAPI protocols.

This is a firewall / proxy issue.
Benjamin Van DitmarsSr Network EngineerCommented:
the fqdn's of the systems are fixed. this you can use in an access policy when you use a sonicwall firewall. i have done this multiple times.

then make an policy to allow traffic from these fqdn's to the fqdn's of the google apps.
and block the rest of the https and http access.

when you do this, make sure that the sonicwall NSA has the local dns server for it's dns resolving.
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