Mandrill bounce rate

Just got this. Not sure how we’re using Mandrill. Who can take point and investigate?

Begin forwarded message:

From: Mandrill help@mandrill.com
Subject: [Mandrill Alert] Bounce Rate Increase: 6.9%
Date: February 28, 2014 at 3:47:32 PM PST
To: infra@mozilla-community.org

Mandrill
Your bounce rate for today is currently 6.88%, compared to your 90-day average bounce rate of 0.58%.

I’ll take a look.