I don’t know if discourse it self does use mandrill as email delivery provider or not. However I think here are some that use mandrill.
I have one small issue which I can’t figure out. Mandrill does add tracking urls which leads to scam warning in mail clients like thunderbird. With other forum softwares I did edit the mail template and give all links a non link title which solves the problem. But I can’t figure out where to do this for discourse, so I tried to disable from the mandrill interface. The only option I could find is Settings->SendingDefaults-TrackOpens, unfortunately did disabling this feature not solve the issue.
How did you solve this small issue?
Thanks in advance Slind