1. Mailtrim Mailtrim is one of the feature-rich free email clients that offers a clean and modern design alongside offering plenty of useful features. Some of the most striking features of MailTrim include an intelligent inbox, customized email signature, response later feature, and impressive archives. MailTrim Vs Outlook: Distinctive Features: Easy to set up and use Intelligent Inbox that allows users to receive emails from different accounts at the same time. MailChimp inbox classifies inbox from different accounts separately by sorting them into different folders. A smart search feature allows you to retrieve just what you need - whether that be an attachment or email content. Customized displays and an advanced dashboard that gives complete visibility and tracking of threats It has more features like flagging, archives, and responding later. Mobile app available for android, iOS, and Windows Supporting Platforms: Windows, Android, macOS, iOS Pricing: Available for Free