Mandrill installation is not hard at all. All you have to do is register on the mandrill.com website and install the widget in amoCRM in “Settings” and “Integrations. Then, you will be asked to provide your Login and API Key. For that, go into your account in Mandrill, go to Settings. Under the SMTP & API tab you can find your SMTP Username, which is used as your login name. You can also create a new API Key or use an old one. Once done, type your SMTP Username (login) and API Key in your amoCRM widget.