Mandrill is an email infrastructure service offered as an add-on for Mailchimp that you can use to send email notifications.
On the Mandrill Side
Set Up an Account
Login to Mailchimp then go to Automation and Transactional E-mail
Set Demo Usage - then Launch App - Yo uwill You will be redirected to Mandrill
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Mandrill
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Create a Domain
Click the Settings tab from the left-side navigation menu.
Click the Domains tab from the top navigation bar.
Click Set up your sending domain button. Add the domain from which you wish to send emails. Click the Add button.
You can view your current added domain in the Domain Details. Verify your Domain by clicking the Verify a Domain button on the right side.
Create an API Key
In the Settings section, click the New API Key button to create the API Key.
Add a description of your API Key and click on the Create API Key button to generate your API Key.
After successful API Key creation, you will be able to see:
Host
Port
SMTP Username
SMTP Password
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In TurnKey Lender, under the Settings → Integrations → Email Notification section, use the following settings
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Service: Custom SMTP server
From address: Your company email address
From name: The name to be used in notifications
Login: SMTP Username provided for the API Key
Password: SMTP Password provided for the API Key
Enable SSL checkbox: Enabled
Host: host provided for the API Key
Port: port provided for the API Key