Thunderbird sometimes attached the wrong messages when forwarding multiple messages by attachment.A message sent with multiple attachments sometimes only sent one.Attachment sizes were no longer included on printed emails.Composing a message from a template with attachments failed due to a temporary file being removed.Delivery Status Notifications were only shown for the first recipient.Message Security popup did not display all recipients due a missing scrollbar.Thunderbird will now warn if an S/MIME encrypted message includes BCC recipients.Thunderbird gives you IMAP/POP support, a built-in RSS reader, support for HTML mail, powerful quick search, saved search folders, advanced message filtering, message grouping, labels, return receipts, smart address book LDAP address completion, import tools, and the ability to manage multiple e-mail and newsgroup accounts. There are lots of add-ons available for Thunderbird that enable you to extend and customize your email experience. Thunderbird gives you control and ownership over your email. Thunderbird is developed, tested, translated and supported by the folks at Mozilla Corporation and by a group of dedicated volunteers. It is a local (rather than a web-based) email application that is powerful yet easy-to-use.
Thunderbird is a free, open-source, cross-platform application for managing email and news feeds.