How do I restrict mail sending option to a Support Rep?

How do I restrict mail sending option to a Support Rep?

You can setup a new Profile by restricting mail sending option and associate the Profile to Support Reps.

To create Profile, Goto Setup > Admin Settings > Profiles >Add new profile >and un-check the Mail Send option and Save the Profile.

Goto Setup > Admin Settings >Support reps >edit the support rep and associate the Profile.

Note: You can see Profile link only if you add the Second Rep for your organization.

For more, refer Profiles and Support Reps.