Email clients are especially important for the business user but are useful even for those not dependant on a corporate email server. Even if you don't use them to check your email on a daily basis, they're handy to keep an offline backup of all your email in case of problems with the service.
Mozilla Thunderbird
It is an e-mail and news cross-platform client software package by Mozilla Foundation. Thunderbird can manage multiple e-mail, newsgroup and RSS accounts and supports multiple identities within accounts. Features like quick search, saved search folders , advanced message filtering, message grouping, and labels help manage and find messages. Just like Firefox, the tons of extensions and themes for this client makes it very secure and flexible to enhance your productivity.
Download Mozilla Thunderbird
Claws Mail
Claws Mail is a free, GTK+-based, open source email and news client. It is very light lightweight. Like Firefox , the wide variety of plug-ins for this email client makes it very flexible and secure.
Install claws-mail in Ubuntu
sudo aptitude install claws-mail
KMail
KMail does the threaded view better than the other tools, using line spacing to denote replies to messages in a thread. The search bar at the top can be used to search for messages, and you can use the drop-down list on its right to refine your search. For example, choose Has Attachment to limit your search to messages with attachments.
Download kmail from ubuntu software center
Evolution
Evolution is a fully featured open source groupware application — and a powerful, flexible and generally great email client, too. Evolution makes it easy to connect to Microsoft Exchange servers, filters spam using SpamAssassin and supports S/MIME for secure messaging.
By default Evolution install in uuntu desktop
Some features of Evolution
* Evolution manages multiple POP, IMAP, Microsoft Exchange and local email accounts.
* Evolution integrates calendar, address book and email.
* Flexible filters and virtual folders for message organization, classification and prioritization.
* Evolution integrates with SpamAssassin for junk mail filtering, can train the Bayesian part easily.
zimbra
zimbra is free of cost most realiable full featured email client software for ubuntu desktop and Zimbra Desktop client allows you to meld the online and offline worlds – storing and synching your email, calendar, contacts, files and documents in the cloud, yet having them locally accessible. Zimbra Desktop aggregates information across accounts (Zimbra, Yahoo! Mail, Gmail, Hotmail, etc.) and social networks (Facebook, Digg, Twitter, etc.) to help make communicating and sharing information easier than ever.
Download zimbra
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