Mozilla Thunderbird is a secure, fast and easy-to-use email client. It has RSS support to receive news, articles or anything from a site that has been subscribed. It is also possible to subscribe to newsgroups. It supports multiple POP3 and IMAP accounts, and allows you to open emails in HTML or plain text.
It has an antispam filter, and includes very effective techniques to detect and filter the junk mail which derives to a special folder, but can be accessed. The user can mark some emails as spam and Thunderbird will learn from those decisions. Phishing protection has been added and is warned when the user is being redirected to a different page than the one shown on the link to which they want to access.
It is possible to organize in a simple and very efficient way the incoming mail in folders according to previously defined filters. They are also very efficient and fast the searches of mails thanks to the indexation that applies to all the messages entered.
This client has a system of tabs, similar to Firefox, which offers the possibility to open, edit or create emails in different tabs.
The new interface integrates chat clients to be able to chat online with contacts, supporting Facebook, Google Talk, IRC, and access to Twitter accounts. To configure Facebook chat you must enter the "File" menu option, then "New" -> "Chat account", to later enter the username and password used in that social network.
What's new is the ability to add add-ons to add specific features, for example to synchronize contacts with those of Gmail accounts. They can be downloaded from here.
ThunderBird 45.7.1 is the latest version (updated in February 2017), which is available for Windows, Linux and MacOS; And translated into several languages, including Spanish. It's a great option compared to other similar tools like Outlook Express and it's totally free. If you have chosen Firefox instead of Internet Explorer you will probably also prefer this program.
This new version is more secure, flexible and faster. Use the Mozilla Gecko 24 engine.