XF 1.4 Prevent Conversation Email's after certain number of particapants

I have a couple users who'd like to have a conversation with more than 20 people at a time. I know I'm able to raise the conversation participants past five but I'm afraid of hitting email quota.

While I also can disable the an email being sent for conversations, I'd like to be able to have an if statement based on conversation participants.

For example, if a conversation has more than five participants, the system will not send an email and only display a notice after logging in to the site. Less than five participants and it functions as normal sending an email upon a new conversation message posted.

Is this possible?
 
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