Information that may answer your question

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Hot Issues

Version	Problem	Workaround
Thunderbird 24	Signature is faded or grey	The linked support topic contains a workaround while the bug is fixed.
Thunderbird 24	Printing of signatures broken	This bug will be fixed in Thunderbird 24.0.2
Thunderbird All versions and McAfee	High CPU usage, a message 'Sending of message failed. Unable to open the temporary file C:\Users\<user name>\AppData\Local\Temp\nsmail.tmp. Check your 'Temporary Directory' setting.' and in extreme cases Thunderbird crashes	McAfee have been aware of the issue since early 2013. Issues should be raised with McAfee so that they can fix their product.
Thunderbird 17 and McAfee	Thunderbird is very slow with intermediate "not responding" message	Open McAfee and uncheck Email attachments under Real Time Scanning > Settings > Scan these attachments and locations Eventually disable McAfee Anti-Spam Thunderbird Extension in Thunderbird. The official workaround supplied by McAfee 22nd May 2013 Disable boot dats (Open security center and under startup settings in real time scanning settings, change it to check for all known threats during startup) Reboot into safe mode (this will reset the cache) Reboot into normal mode. Thunderbird performance should be back to normal after this workaround.
Thunderbird 16 and 17	Thunderbird is inserting random and incorrect font size tags in the middle of words , which consequently breaks the spell-checker	In the Menu bar at the top of the screen, click Firefox and then select Preferences or Settings, depending on your macOS version.Click the menu button and select Settings. Composition | General and then click on the Restore defaults button.
Thunderbird 17 on Windows XP only	With some Windows themes, the Title bar is an illegible blue color due to a bug	In the Menu bar at the top of the screen, click Firefox and then select Preferences or Settings, depending on your macOS version.Click the menu button and select Settings. | Advanced | General Click on the Config Editor... button, Then set the mail.tabs.drawInTitlebar preference to false.
Thunderbird 17	Multiple messages windows are displayed when Thunderbird 17 launches	Update to version 17.0.2 or later
Thunderbird 17	QuickText addon causes Thunderbird 17 to crash	Update QuickText to version 0.9.11.5
Thunderbird 16	Spell checking broken if you backspace when using HTML email and a font like "Helvetica, Arial"	Fix in Thunderbird 17
All versions	Is there a version of Thunderbird for IOS (iPhone,iPad etc) and Android?	There are no current plans to release a version of Thunderbird for these operating systems

Learn the Basics: get started

• Installing Thunderbird
• Make Thunderbird the Default Mail Client
• Glossary of Terms including types of Accounts
• Configuring Email Aliases
• Using Identities
• Addressing an Email
• Keyboard shortcuts - perform common Thunderbird tasks quickly
• Keyboard Shortcuts for Searching
• unofficial but excellent FLOSS Thunderbird manual

Thunderbird features

• Using the Lightning Calendar Add-on
• Search any message anywhere
• Fast Searching using the Quick Filter Toolbar
• Search the Web inside Thunderbird
• Filelink for Large Attachments
• Instant Messaging and Chat

Configure an account

• Automatic Account Configuration
• Manual Account Configuration
• New Email Address
• How to Subscribe to News Feeds and Blogs
• Creating a Newsgroup Account
• Thunderbird and Yahoo
• Thunderbird and Hotmail
• Thunderbird and Gmail
• Configure Origin Address for Multiple Gmail Accounts
• Thunderbird and AT&T
• Thunderbird and Comcast
• Thunderbird and Verizon

Migration

• Moving Thunderbird Data to a New Computer
• Switching to Thunderbird

Privacy and security settings

• Thunderbird and Junk / Spam Messages
• Configuring Certificates
• Digitally Signing and Encrypting Messages

Customize controls, options and add-ons

• Reply Above or Below Quoted Text
• How to Customize the New Mail Sound
• How to Install and Use another Language in the Dictionary on Thunderbird

Fix slowness, crashing, error messages and other problems

• Troubleshoot Mode Thunderbird
• Thunderbird is stuck in Safe Mode
• Cannot receive messages
• Names but no Email Addresses are Displayed
• Thunderbird Crashes
• Mozilla Crash Reporter TB
• Plugin Crash Reports TB
• Rebuilding the Global Database
• Thunderbird Software Update Failed

How to ask your question

As free and open software, Thunderbird is supported by a volunteer community and therefore Mozilla doesn't provide email or fax or phone or live chat support just community support forum support.

In the forum, your question will be posted in public (so don't post your email address or phone number!), allowing community volunteers to help you solve your problem.

1. First, please tell us about your computer:

• Copy and Paste Thunderbird's Help | Troubleshooting Information (To tell support contributors your Thunderbird version, Operating System, mail providers, POP, IMAP and SMTP settings, and what extensions/plugins/themes are installed - which should help diagnose the problem. Make sure "Include account names" is unchecked so you don't expose personal identifying information.)
• Who your ISP is (e.g. Verizon)
• What antivirus and firewall programs you are running (firewall and anti-virus can slow down and block Thunderbird)

2. And then please tell us concisely:

• What you did
• What happened
• What you expected

3. Ask a question in the Thunderbird support forum using the link below. Make sure to include the information you gathered in the previous steps.