Messages with large attachments are often rejected by mail servers. Thunderbird can use web-based storage services to send large file attachments.
This page explains the privacy implications of allowing remote content like images to be displayed in email messages.
This article explains how the "archive" feature of Thunderbird works.
What message filters are, how to create and use them effectively.
A mailing list is used to send one email to a group of contacts. This article explains how to create and use mailing lists in Thunderbird.
This article explains how to create and use custom signatures (text or images that are automatically appended to messages).
The Ignore Thread (or Subthread) feature is very useful for mailing lists. It lets you skip reading the rest of a conversation you're not really interested in.
IMAP stands for the Internet Message Access Protocol. It enables a mail client (such as Thunderbird) to access messages stored on a mail server. It is more modern and fully featured than POP (Post Office Protocol), which is the other major protocol for accessing mail messages. Most email providers now support IMAP. To see whether your account uses IMAP or POP, check the Server Settings page in the Account Settings.
When clicking hyperlinks in email, your default web browser should open and display their content. Learn why that may fail and why links may not be clickable.
This article explains how to block a particular sender in Thunderbird.
This tutorial explains how to set up Thunderbird to digitally sign, encrypt and decrypt messages in order to make them secure.
This article explains how you can subscribe to a personalized email address with Thunderbird.
Message tags let you organize your email messages by categories. Learn how to use them.
Thunderbird includes a message indexing system that improves search performance and displays faceted (categorized) search results.
The Quick Filter toolbar is used to limit the number of messages that are displayed in the message list. Learn more about how to use it.
If you cannot receive messages, this page provides a series of steps you can use to check for common problems.
If you cannot send messages with Thunderbird, this page provides a series of steps you can follow to check for common problems.
This article explains how to configure the columns that Thunderbird displays in message lists.
This article explains how to use Thunderbird (or other services) to send large attachments.
This article explains how to use attachments.
When sending messages from email clients that use the Microsoft Exchange server, a file attachment called winmail.dat may be added. Learn how to prevent this.
Instantly take part of a message and search for it in Bing, Yahoo, Twitter or other websites.
This article explains the sending and receiving functions in Thunderbird.
How to add recipients to an email message in Thunderbird, and tips for handling many recipients efficiently.
Threading is a useful way of displaying message list in Thunderbird with your messages grouped in tree structures by conversations. Here's how to enable it.
We'll show you how to merge inboxes from various POP accounts to make what is called a global inbox, where all of the mail can be displayed in one place.
Illustrated overview of user facing changes in Thunderbird 78.