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I've checked your Test Form for this and it seems okay. I don't see your email in our bouncelist. It appears that it's going through the SMTP Remote.
Have you tried checking your spam/junk folder? What email address and configurations are you using in Mandril?
I could see that as of the 15th before it looked like you had previously been receiving emails more recently or was this not the case? Were you trying this during and after or?