Open Mozilla Thunderbird. Go to the top menu and open a new message by clicking the Write button. In the new message window, you can compose your email signature using a basic toolbar or, to adjust it to your needs, you can use available formatting options under the Insert and Format tabs as well. Thunderbird is an open-source desktop-based email client application that can be accessed on multiple platforms like Windows, Mac, Linux, and Ubuntu operating systems. Designed and developed by the Mozilla Foundation; Thunderbird allows users to manage emails, News feeds (RSS), Newsgroups, and other mailbox features. MozBackup is a simple utility for creating backups of Mozilla Firefox, Mozilla Thunderbird, Mozilla Sunbird, Flock, SeaMonkey, Mozilla Suite, Spicebird, Songbird and Netscape profiles. It allows you to backup and restore bookmarks, mail, contacts, history, extensions, passwords, cache etc.

• TT DeepDark

  Simple and smooth dark complete theme for Thunderbird

  by steva

• MS Office 2003 JB Edition

  MS Office 2003 Theme.

  by Jarek Bialkowski

• Nuvola TB

  Theme based on the Nuvola icon set by David Vignoni (http://icon-king.com/?p=15).
  You can find developer versions under http://mozilla.paenglab.ch/

  by Paenglab

• Metal Lion Sea Monkey

  Metal Lion meets SeaMonkey.

  by Frank Lion

• Classic TB2

  Theme using mostly TB2 icons plus the best of TB1.5, TB3, and later versions.

  by Corey Drechsler

• Walnut2 for Thunderbird

  Walnut2 for Thunderbird, based on icons from art.gnome.org. Walnut2 is based on Walnut but with better looking wood panels.
  Supports Thunderbird versions 53.0 to 60.0. From version 61.0, Thunderbird will drop support for full custom themes.

  by alfredkayser

• Phoenity Shredder

  A simple and colorful theme for everyone.

  by Dillinger

• Silvermel

  A Creamy Silvery Experience

  by ShareBird

• Walnut for Thunderbird

  Walnut for Thunderbird, based on icons from art.gnome.org, and sporting a wooden look.
  Supports Thunderbird versions 53.0 to 60.0. From version 61.0, Thunderbird will drop support for full custom themes.

  by alfredkayser

• Nautipolis for Thunderbird

  Nautipolis for Thunderbird: High-quality, solid theme based on icons from art.gnome.org.
  Supports Thunderbird versions 53.0 to 60.0. From version 61.0, Thunderbird will drop support for full custom themes.

  by alfredkayser

• Metal Lion Silver Sea Monkey

  Metal Lion meets SeaMonkey and makes it shine..

  by Frank Lion

• Noia 2.0 eXtreme (v3.x)

  This Noia 2 eXtreme theme v3.x version has been rewritten / v2.x (still available but only for old TB).
  Options are available with an associated extension.
  See also my Web site for last versions (compatible TB 60).
  Icons by Carlitus.

  by Gerard D.

• NoGlass

  Remove Aero glass in TB and give the option of colored icons

  by Paenglab

• Charamel

  A Creamy Sugary Experience

  by ShareBird

• xpDefault Colored Buttons

  Default XP theme for ThunderBird 45. (Mail and Lightning calendar)
  ---
  After long time of inactivity, Michal Stanke decided not to update xpDefault.
  I propose to try, and make this version, tested on Vista and Win 8.1.
  new 45.0.3 16 oct 2016

  by AlainMop, Michal Stanke

• Noia Fox

  Theme for Firefox and Thunderbird
  Based on Noia Iconpack by Carlitus (deviantART)
  Noia Fox options is here (small icons, square tabs,..).

  by David.Vincent

Mozilla Thunderbird is one of the popular free, desktop-based and open-source emailing application. It permits users to manage their emails, newsgroups, chats, etc., in an efficient manner. Thunderbird has various number of add-ons also that a user can use to customize and enhance their emailing experience. Moreover, Thunderbird is available in different versions for Windows, Linux and Mac OS. It supports various languages to make the emailing experience more convenient for the users. Apart from having so much of benefits, there are some Mozilla Thunderbird Errors, which are commonly encountered by the users and need to be fixed on time. Therefore, in this post, we are going to discuss how to Fix Thunderbird Problems & Errors.

Common Problems or Errors in Thunderbird Along With Solutions

Problem1: Thunderbird Cannot Delete Messages

If a user is not able to delete an email message from Thunderbird, then the most common reason is corrupt trash folder. To Fix Thunderbird Problems , follow the mentioned below steps:

1. To start the process, open your Profile folder
2. After that, click on the Menu icon from the top right corner of the Thunderbird window.
3. Then, choose Help option >> Troubleshooting Information option from the displayed list. After that, a Troubleshooting Information tab will open. Click on the Open Folder button under the Application Basics tab. It will display all the files of that profile
4. Now, you can close and exit the Thunderbird application
5. Then, from the File Manager, you need to open Mail folder or ImapMail folder (based on the POP or IMAP account a user is using)
6. After that, you can open the folder with that has incoming mail server name (like imap.googlemail.com or pop.googlemail.com)
7. Now, choose the Trash and MSF files and delete all of them. In some of the accounts, it is named as Deleted or Bin
8. Restart the Mozilla Thunderbird Application
If you are using an IMAP account, a new Trash folder is created automatically by Thunderbird.
If you are using POP account, then move to the Folder List >> right-click on account name >> choose New Folder. After that, you can give a name to the folder i.e. Trash and hit Create Folder button to confirm

After following all the steps above to Fix Mozilla Thunderbird Error, if a user is still not able to delete the email messages, then it suggested to migrate to some other email application like Outlook. However, to make use of Microsoft Outlook, a user need to convert MBOX file data to PST format in order to solve Mozilla Thunderbird email issues

Problem 2: Thunderbird unable to send email messages

Another common problem faced by the users is Thunderbird is unable to send emails. There can be two possible reasons behind it:

• Improper Settings of Thunderbird
• ISP has Blocked Port 25

Now, to Fix Thunderbird Problems, a user can follow the steps mentioned below:

1. First of all, make sure that Thunderbird Settings are configured in a proper manner

• Incoming mail server (POP3/IMAP server): mail.your_domain.com
• Outgoing mail server (SMTP server): mail.your_domain.com
• Username: the complete email ID such as email@your_domain.com
• To have a successful login, SMTP authentication must be enabled

2. After checking all above, try to use an alternative TCP port 2525 for the SMTP Server.

Problem 3: Thunderbird Cannot receive Email Messages

It might also be possible that Thunderbird account is unable to receive any messages &Thunderbird not showing emails, so to make sure that account is configured properly. To do the same, follow the steps mentioned below to resolve Mozilla Thunderbird email issues:
1. Click on Tools >> Account Settings Option
2. Now, choose the Server Setting option from the list displayed in the left pane
3. After that, check the Configuration Settings from the top of the page and make sure the connection with the incoming mail server
4. Here, this email account provider will provides you the connection information related to the servers. After that, make sure the account settings are matched to these settings

Problem 4: Thunderbird Closes Unexpectedly

When Thunderbird terminates unexpectedly, it results in application crash. However, if there is a sudden shutdown, Mozilla Crash Reporter displays. There can be various reasons, which are responsible for the crash. So, to fix Thunderbird Problems, the best approach is to post-crash report ID.

If this does not work, you can attach the stack trace in your bug report or in any forum. This will help in resolving the actual cause.

Mozilla Thunderbird

Problem 5: Warning- Server doesn’t use encryption

Before doing anything, make sure that the server supports encryption. Juniper vmx qcow2. It is because if it does not support, then a user needs to change the Thunderbird settings. For this, click Change Settings button and apply correct settings

If it does not support encryption, then a user has to use it at his or her own risk. To do this, first of all, check the box corresponding to I understand the risk and then, click on Create Account button. Another way is, move to the mail service provider, which provides a secure connection like Yahoo, Gmail, and much more.

Start Thunderbird in Safe Mode & Fix Thunderbird Problems or Errors

To troubleshoot any persisting Mozilla Thunderbird email issues, a user can start the Thunderbird in the Safe Mode. It is because a user can change the Thunderbird settings in the safe mode. If required, one can disable add-ons also, which creates Thunderbird issues. In order to make sure that the problem is because of a specific add-on, a user can compare the application behaviour in Normal mode and in Safe mode.

1. To begin the Thunderbird in Safe mode, perform the following steps:

• If Thunderbird is not running: you can press & hold the Shift key and open Thunderbird in a safe mode.
• If Thunderbird is running: Go to the Help option from the Menu and choose Restart with Add-ons Disabled… option. After that, click on the Restart button from the dialog box
  2. After that, a dialog box appear for Thunderbird Safe Mode, you just need to click on Continue in Safe Mode button to begin the Thunderbird in Safe Mode

As discussed above there are many issues and Mozilla Thunderbird Errors that a user keeps on encountering on the frequent basis. Therefore, to avoid all such Thunderbird issues permanently, a user is advised to switch to some other email client such as MS Outlook. It is also one of the most efficient emailing programs with many responsive features and function.

Mozilla Thunderbird For Mac

The Bottom Line

Mozilla Thunderbird 2

Considering all the problems discussed above related Thunderbird, a user is advised to switch to MS Outlook. Now, to fix Thunderbird Problems & Issues, a user is migrating towards Outlook. Therefore, to perform this migration successfully, a user is advised to use SysTools MBOX to PST converter and move all Thunderbird mailbox to MS Outlook in just a few number of clicks.