Privacy and Security

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Mailsleuth

Mailsleuth is a add-on for Thunderbird that provides you a full email header analysis of any email in your Inbox. This add-on is designed to provide a report on the email headers on any email you choose from your inbox. MAJOR updates for Feb 2013!

Rated 4 out of 5 stars (6)
809 users

Close Proxy Authentication

Provides transparent proxy authentication on your enterprise network.
Close authentication dialog if login on proxy failed.

Rated 5 out of 5 stars (2)
788 users

ThunderBayes

SpamBayes integration for Thunderbird - a better spam filter.

Rated 3 out of 5 stars (13)
779 users

AlertSwitch

Turn on/off the alert shown when new message arrives.

Rated 4 out of 5 stars (3)
755 users

Spamato4Thunderbird

A multi-faceted, collaborative approach against spam.

Rated 2 out of 5 stars (31)
666 users

Lock The Text

Encrypt your text data in browser before you submit it to a network

Rated 5 out of 5 stars (10)
661 users

XML Digital Signature Tool

XML Digital Signature Tool is a Firefox add-on for processing Digital Signature in XML documents
(Please read the installation instruction in the "Developer Comments" section before downloading)

Rated 4 out of 5 stars (3)
629 users

abusix Spam reporter

The abusix Spam Reporter enables you to forward and report spam to the abusix blackhole.mx systems directly from Thunderbird (free of charge). Thus, you help professionals and security vendors to fight spam much more effectively at the source.

Rated 4 out of 5 stars (4)
597 users

Paranoia

Check if your emails arrived TLS-encrypted (and which corporations were able to read it nevertheless)

Rated 4 out of 5 stars (4)
596 users

CookieFast

Fast toolbar button access to cookie management in a very small package.

Rated 4 out of 5 stars (9)
545 users

Blend In

Blends OS-related values in User-Agent HTTP request header & a number of JS properties, so that Firefox (Thunderbird) appears to sites visited as running on the OS used the most in the world. Since 18.0t17.0.2 Windows is blended by default as well.

Rated 5 out of 5 stars (4)
543 users

Export All Certificates

Adds an option to export all root certificates.

Rated 5 out of 5 stars (1)
524 users

MailSentry IronPort Spam Reporter

Report spam and ham to IronPort - originally written for our MailSentry hosted IronPort customers, it can be used by anyone who has their email filtered by an IronPort appliance.

Rated 5 out of 5 stars (1)
509 users

External Email Alert

Alerts user to confirm that it is ok to send an external email.

Rated 4 out of 5 stars (5)
458 users

Bork Bork Bork!

The Swedish Chef travesty filter and URL blocker. View web pages or mail as spoken by the Swedish Chef like this...

"Zee Svedeesh Cheff trefesty feelter und URL blucker. Feeoo veb peges oor meeel es spukee by zee Svedeesh Cheff leeke-a thees."

Rated 4 out of 5 stars (29)
324 users

Security Settings from Address Book

Sets message security (sign/encrypt) when sending or saving messages based on recipients' address book entry's field "Custom1".

Rated 5 out of 5 stars (2)
321 users

View Your Certificates Email Address

Adds a column for displaying the certificates Email address to the "Your Certificates" tab of the Certificate Manager

Rated 5 out of 5 stars (4)
311 users

GNOME keyring password integration

Extension that allows Firefox and Thunderbird to store passwords in Keyring, Gnome's default password store.

Rated 3 out of 5 stars (8)
300 users

DL for Thunderbird

Allows to convert large attachments to links automatically without 3rd party providers.

Rated 5 out of 5 stars (2)
299 users

KnujOn

Forwards all emails marked Junk (as attachments) to KnujOn.com (note: they collect email reports on the coldrain.net domain). KnujOn is an organization that works to shut down junk mailers by contacting law enforcement, web hosts, etc..

Rated 4 out of 5 stars (12)
256 users