Hope you are doing great. I am from Customer Success team of Cloudways. I have checked your application and found that there are two files in which you have defined the mandrill settings
In both files, there are different authentication passwords. Please check it after making them identical.
Secondly, if it still does not work then check it using port 465 and ssl. I also found a possible solution to change smtp with
Moreover, I request to ask Mandrill support for this issue as well.