You can access your Mandrill accounts through your Mailchimp login, allowing for multiple user logins. Mandrill does not, however, support different levels of access within the account.
Provide Access Using API Keys
You can generate multiple API keys and limit privileges per key. To manage API keys, go to the SMTP & API Info page in your Mandrill account.
Grant Access Through Mailchimp
You can share access with multiple Mailchimp users, although this access is limited to Admin or Owner user types. Lower levels of access cannot access Mandrill.
Admins or Owners can go to the Reports page in Mailchimp and click the Mandrill reports link in the upper right side of the page. This will bring the Admin or Manager directly to the Dashboard in Mandrill.