We have a client who has two webhooks defined in Mandrillapp - both of them reacting to the same events (click, open, etc). These webhooks have a post url of two different sites(dev and live). Eg.

>Post url of dev = http://devsite.com/civicrm/ajax/mte/callback?mandrillSecret=_devkey_

>Post URL of live - http://livesite.com/civicrm/ajax/mte/callback?mandrillSecret=_livekey_

My guess is that - when an email is sent from the live site, these both urls are triggered(on open or click event) and dev site also gets the response which creates a mandrill activity on dev site.

This is what is happening for us - when a bulk email is sent from the live site, a dev also creates a mandrill activity.

Can we conclude that we need to use two different mandrill accounts for two different sites OR there is a way to avoid this (rules, etc)?