Just set usergroup permissions so that they cannot send email.
AdminCP --> Usergroups --> Usergroup Manager --> Edit Permissions ->
Can Use Email to Friend set to No ( in the group Forum Viewing Permissions)
Can Email Members set to No (in the group General Permissions)
If you have the blog, Can Use Email to Friend set to no (in the group Blog General Permissions)
Should you want to disable the Birthday email, ACP --> Scheduled Tasks --> Scheduled Tasks Manager, and disable the Birthdays cron job.
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