Disable voicemail to email


I’m running Asterisk 11 in realtime with my voicemail users in a DB.
Some users do not want to receive their voicemails by email.
Is there any way to disable sending voicemail by email without removing their email in the DB?
I have to remove the email from the database otherwise they keep getting their voicemails.

Is there a simple option to disable email or do I really have to remove the email?