eM Client is a very simple and complete emailing service for Windows that allows users to unify their inbox, contacts, calendars and pending tasks in a single place. This email client is free of cost for personal usage.
Mozilla Thunderbird is a multi-platform open source email client to manage both emails and newsgroups. It is one of the most powerful and easy to use email services that supports IMAP and POP email accounts.
Gmail is a free emailing service provided by Google that comprises all the best features of traditional email. It provides a large storage space shared with Drive and Google Photos. Its user interface is available in 38 different languages that is making it popular worldwide.