Pantheon Mail is a free open source email client forked by the https://alternativeto.net/software/elementary-os/ community from https://alternativeto.net/software/geary/ .
Features
Modern and straightforward interface
Quick account setup
Supports Gmail, Yahoo! Mail, Outlook.com, and popular IMAP servers (Dovecot, Cyrus, Zimbra, etc.)
Mail organized by conversations
Ability to answer directly in conversations or open it in a separate window
Signature
Full-featured HTML mail composer
Fast keyword search with values like from:john
Desktop notification of new mails
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