• The export assistant saves your account settings in a xml based text file (RDF). Supported are pop3, imap and 'local folder' accounts.
• The import assistant imports your saved account settings in a thunderbird profile. Very helpful for example after a new installation or re-installation.

Install accountex for Seamonkey:
accountex-0.2.3-mod.xpi

addressContext is an extension designed to speed up the process of adding email addresses to the address book in Mozilla Thunderbird. addressContext adds an entry to the context menu that allows you to choose between:

• Add Senders/Recipients as Cards -Adds the senders or recipients of all selected messages to the address book, presenting a dialogue window for each sender to allow customization.
• Add Senders/Recipients as List -Adds the senders or recipients of all selected messages to the address book to a new Mailing List entry. Further, since mailing list entries are really Address Book subdirectories, will add the recipients to the main address book, as well.

Install addressContext for Seamonkey 2.5 and above, Thunderbird 8 and above:
addresscontext-0.9-mod.xpi

Install addressContext for Seamonkey 1.0 and 1.1:
addresscontext-0.8-mod.xpi
addresscontext-0.7-mod.xpi

Just select the messages containing the attachments you want to extract and select 'Extract Attachments' and this extension does the rest. No more having to go through each message to extract the attachments!

xSidebar needs to be installed for the options dialog to work.

Install Attachment Extractor for Seamonkey:
These versions are for SeaMonkey 1.1 to 2.0a3.
attachmentextractor1.2.2-mod.xpi
attachmentextractor1.2.1-mod.xpi

This version is for SeaMonkey 1.1 only. It will not work properly in 1.0, 1.5a, nor in 2.0a
attachmentextractor0.9.1.1-mod.xpi

Attachment Sizes adds the ability to see attachment sizes:

1. in the attachment box of messages.
2. in the attachment box of the compose window.

Install Attachment Sizes for Seamonkey 2.0 and Thunderbird 3.0:

AttachmentSizes-0.0.9-mod.xpi

• Based on Version 0.0.9 by Alexander Ihrig et al. http://fux.zuhage.de/attachment_sizes/.
• Extension icon from Attachment Sizes TB 1.0 by pastisman (Luc DISCHERT) https://addons.mozilla.org/addon/75780.

Install Attachment Sizes for Seamonkey 1.0 and 1.1:
attachment_sizes-0.0.8.xpi
attachment_sizes-0.0.5-mod.xpi

To configure ConfigDate in SeaMonkey, select Edit —> Preferences... —> Mail & Newsgroups —> Date configuration

Note:

• The 5 date formats are given by Thunderbird itself.
• The date formats are depending on your systems/regions setting, too (e.g.: "25.08.2005 15:54" in Germany or "2005/08/25 15:54" in US).

Visit extensions homepage for more information including instructions to get the ISO date format, install instructions and a locales list: http://configdate.thunderbird-mail.de/index-en.php

Install ConfigDate for Seamonkey 2.0+:
configdate-0.7-mod.xpi (Updated for SuiteRunner)

Install ConfigDate for Seamonkey:
configdate-0.5-mod.xpi (Updated for SuiteRunner)
configdate-0.4.1-mod.xpi
configdate-0.3.8-mod.xpi

Dictionary Switcher 1.3.1 is now compatible with SeaMonkey 1.1 and above. Please install the latest Dictionary Switcher from addons.mozilla.org at https://addons.mozilla.org/addon/dictionary-switcher/

Mod-Notes:

Version 0.8.2-mod: Updated the Thunderbird component to 1.1.3. Fixed a logic error that was causing errors in the Error Console.

Version 0.8.1-mod: Fixes breakage on SuiteRunner builds due to switching to the hunspell engine. I've also improved compatibility with SeaMonkey 1.0 builds.

Install Dictionary Switcher for Seamonkey:
dictionary_switcher-0.9-mod.xpi
dictionary_switcher-0.8.2-mod.xpi
dictionary_switcher-0.8.1-mod.xpi
dictionary_switcher-0.8-mod.xpi
dictionary_switcher-0.8-mod.xpi

In feedback window the link to the website of that mail client is shown. And you can click on it.

Install Display Mail User Agent for Seamonkey 2.1+:
dispmua-1.6.5-mod.xpi
Contributed by Marcelo Bastos

Currently only one address book can be searched at a time. Users with multiple address books cannot search for duplicates between address books. This feature is planned for a future version.

Install Duplicate Contact Manager for Seamonkey 2.0 and Thunderbird 3.0:
duplicate_contact_manager-1.2-mod.xpi

Changes in this version:

• Repacked in jar file format.
• Updated install.rdf and chrome.manifest for SeaMonkey 2.0 and Thunderbird 3.0.
• Split CSS for main overlay into a separate file.
• Retained the GUID of Duplicate Contacts Manager 1 but incorporated the changes from Duplicate Contact Manager 2 by Alfred Peng and Valeryan_24@laposte.net.
• Included the changes by iav (Igor Velkov) from his fork of Duplicate Contact Manager 2 on sourceforge.net.

Install Duplicate Contact Manager for Seamonkey 1.0 and 1.1:
duplicate_contact_manager-0.6-mod.xpi (SeaMonkey 1.0/1.1.* only).

Changes in this version: The Mailto option will open the integrated Mail client in SeaMonkey directly; and in Firefox it will invoke the internal Firefox API that opens an external mail client directly instead of the cumbersome and roundabout method currently used.

Install Email This! for Seamonkey:
email_this_bookmarklet_extension-2.0.0-fx.xpi (SuiteRunner Ready requires xSidebar).

The second thing this extension does is allow you to set a default To address for newly composed messages based on which folder you are working in. This could be very useful for mailing lists – when you create a new message in the mailing list folder, your message would automatically be correctly addressed.

In both cases, if the current folder has no From address or To address specified, the extension will check the parent folder, so you can control the settings for an entire branch of your folder tree at one time.

Install Folder Account for Seamonkey 2.0:
folder_account-3.0-mod.xpi

Install Folder Account for Seamonkey:
folder_account-0.84-mod.xpi SuiteRunner Ready
folder_account-0.78-mod.xpi SuiteRunner Ready
folder_account-0.72-tb.xpi

You can set arbitrary flags on arbitrary folders, too. Mostly I think this makes the icons change, except the 'Junk' flag, which accomplishes what I described above. Right click on a folder in the main view and find 'Flags...' (if you're using the U.S. English version) to change flags on a certain folder. For SeaMonkey 2.0 and above, install the official version of Folder Flags from addons.mozilla.org:
https://addons.mozilla.org/seamonkey/addon/1898

Install Folder Flags for Seamonkey 2.0:
folderflags-1.2-mod.xpi
folderflags-1.1-mod.xpi

Install Folder Flags for Seamonkey 1.1:
folderflags-1.0-mod.xpi

Folderpane Tools allows for customization of the Thunderbird folder pane. Accounts can be rearranged and the startup folder can be chosen. For more information about using the extension, visit the extension homepage. Requires Thunderbird or SeaMonkey.

Install Folderpane Tools for Seamonkey 2.2+ and Thunderbird 5+:
folderpane_tools-0.6.1.xpi

What's New:

• Updated for Thunderbird 5 and SeaMonkey 2.2.
• Added Hungarian Locale contributed by "DirektX" <direktx@freemail.hu>.
• Renamed locales [de-DE, fr-FR, nl-NL, pl-PL] to [de, fr, nl, pl].
• Updated locales: de, es-ES.
• New locales ca-AD, cs-CZ, pt-PT, sv-SE, sr.
• [fix] On OSX don't show the first run alert message as it can't be dismissed.

Install Folderpane Tools for Seamonkey 2.0 and Thunderbird 3.0:
folderpane_tools-0.6-mod.xpi

What's New:

• Updated for Thunderbird 3.0 final.
• Fix for overriding the internal Thunderird 3.0 folderpane sort algorithm. Patch by Ben Lerner <blerner at cs.washington.edu>
• Updated install.rdf for Shredder (Thunderbird 3.2a).
• Refactored the in-line javascript in folderpane.xul into a separate folderpane.js file.

Install Folderpane Tools for Seamonkey 2.0 and Thunderbird 3.0b4:
folderpane_tools-0.0.5.1-mod.xpi

Install Folderpane Tools for Seamonkey 1.0 and 1.1:
folderpane_tools-0.0.5-tb.xpi

Thunderbird, like many other email clients, uses the mbox format to archive email. It's curious that Thunderbird does not have a function that lets you import or export files in this format and this lack is sometimes a problem when you want to move the accounts from a pc to another one or when you want to migrate (for example) from Mozilla to Thunderbird.

MboxImport makes the import/export of mbox files very easy.

To import, you must select the destination folder, then right-click and choose the item "Import mbox file" from the menu "Import/export". To export, simply right-click on the folder or on the account and to choose the item you want from the menu "Import/export". The menu is also under "Tools".

ImportExportTools (MboxImport enhanced) now allows you to export and import messages with more flexibility, with the following options:

• Tools Menu --> Import/Export in mbox/eml format
• Context menu on folders panel --> Import/Export in mbox/eml format
  • export of folder in a single file (mbox format), with also the subfolders if you want;
  • export of all messages in single files (eml format);
  • export of all messages in single files (html or plain text format), with an index;
  • export of all messages in one single plain text file;
  • export of the index of the messages in a folder;
  • mbox files import;
  • eml files import;
  • import of all the eml files existing in a directory;
• File menu --> Save selected messages
• Context menu of thread panel --> Save selected messages
  • saving multiple messages in eml/html/plain text format with just a click;
• Edit menu --> Copy message to clipboard
• Context menu of thread panel --> Copy message to clipboard
  • copy the message with headers to clipboard.
• Context menu on an EML attachment
  • import file in the folder

Install ImportExportTools for Seamonkey:
ImportExportTools-2.2-mod.xpi
ImportExportTools-1.7.1-mod.xpi
ImportExportTools-1.6.1-mod.xpi
ImportExportTools-1.6-mod.xpi
ImportExportTools-1.5.0.1.xpi

Install MboxImport for Seamonkey:
mboximport-0.5.8.2.xpi

LookOut is a plugin which allows will allow Thunderbird to interface with Microsoft's mail tools by decoding metadata and attachments encapsulated/embedded in a TNEF encoded attachment. The TNEF decoding engine was inspired (with permission) by the tnef.sf.net project.

There are a few tnef decoders out there that do an excellent job. One could simply use one of these decoders as a helper application. This extension was created for two reasons. The first being that LookOut allows you to see what files are hidden in the anonymous encapsulation (winmail.dat). The second reason is the realization that some lack the desire to opperate more than one or two nonintegrated applications and LookOut makes the decoding part of the application. I would throw up a screenshot but that would be useless as LookOut is designed to be in the shadows doing it's thing and not be seen.

It should be noted that TNEF encapsulations will put a higher net and proc load on the IMAP server (or any other server for that matter). This is because there is no way for the client to ask for a sub-part of the TNEF file (whereas it can ask for a MIME part). If the client is to extract any sub-parts of the TNEF part it will need them all.

For SeaMonkey version 2.0 and above please install LookOut from addons.mozilla.org:
https://addons.mozilla.org/seamonkey/addon/lookout/

Install LookOut for Seamonkey:
lookout-1.2.3-mod.xpi (For SeaMonkey 1.0 and 1.1.* only. This version doesn't work in SuiteRunner)
lookout-1.2.1-mod.xpi (For SeaMonkey 1.0 and 1.1.* only. This version doesn't work in SuiteRunner)
lookout-1.2-mod.xpi (2007072301) (For SeaMonkey 1.0 and 1.1.* only. This version doesn't work in SuiteRunner)

Right Click -> Classification -> Change directory and Move -> Right Folder

If you select multiple emails and want to move each mail in it's respective folder

Right Click -> Classification -> Move
or
Tools -> Mailclassifier -> Move messages

Instead, if you want to classify all the message in the current folder use:

Tools -> Mailclassifier -> Classify all

Install MailClassifier 1.0 for