Lost password not working with Mandrill

I have set up everything properly, but the “recover your mail” does not get sent. I using some other plugins to sent mail (Contact Form 7) and they work well with Mandrill. When I submit the request for a password change, the success message is shown, but no mail is sent.

Looking into my error_log:

wpMandrill::sendEmail: Exception Caught => HTTP Code 500: https://mandrillapp.com/api/1.0/messages/send-template

wpMandrill::wp_mail_native: my_email_addresss@gmail.com (Password Reset Feature from “VendoAndroid”)

Any ideas?

Thanks

http://wordpress.org/extend/plugins/wpmandrill/