YPOPs! is an application which emulates a POP3/SMTP mail server and provides free POP3 and SMTP access to Yahoo! Mail. It does not depend on Yahoo’s POP3/SMTP mail server. You can use a mail client of your choice!
DavMail is a POP/IMAP/SMTP/Caldav/Carddav/LDAP gateway allowing users to use any mail client with Exchange, even from the internet through Outlook Web Access on any platform, tested on MacOSX, Linux and Windows.
Claws Mail is a GTK+ based, lightweight, and fast e-mail client and newsreader. Supports various format such as POP3, IMAP,SMTP etc. , having multiple accounts, spell-checking, address book, SSL, GPG, filtering, i18n, and more. It is further extended by plug-ins
Jack Mail Client: developed in Java This is a simple mail client uses any mail server with a minimal configuration you will have a robust email client.
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