Blocking Internet to few users alone

Hi 
in my network I have a cisco 1941 router and 3750 switch. Users are configured on vlan 2 with a/24 range. I need to block Internet and allow email for selected users.
i try to exclude the selected user from getting natted so their internet will be blocked but it's prevented the users from email too (users can send email but not receive). The users uses pop account to get there email
so how to block the Internet to selected users but allow only email.
regards
logesh

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Posting
Assuming you have an ACL to block your /24, add an ACE to allow access to known email server IPs or open up the ports used by pop (usually port 25), or do both.

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