WarnAttachment

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About this Add-on

WarnAttachment shows an additional dialogue to confirm potentially dangerous attachments. Some attachments like executables etc. are completely blocked. This reduces the risk of malware especially for inexperienced users.

Version Information

Version 2.21 Released Oct. 31, 2026 32.4 KiB Works with Thunderbird 126.0 - 160.*

Tested with the new Thunderbird 160 Beta
File names are now normalised for better protection
The MIME type is now read out (not yet used for blocking or warning messages)
Extended the extension lists to cover the latest threats:
- Warn: DOTM, XLTM, XLAM, POTM, PPAM, SLDM, RTF, SVG, SHTML, XHTML, GZ, TGZ, TAR, XZ, ZST, ACE, ARJ, ONE, SH, URL
- Block: PS1, PSM1, PS1XML, VHD, VHDX, MSIX, APPX, APPXBUNDLE, APPINSTALLER, XLL, REG, CAB, SETTINGCONTENT-MS, LIBRARY-MS, SEARCH-MS, IQY, SLK, ACCDE, DESKTOP, COMMAND, APP, DMG, PKG

Source code released under GNU General Public License, version 3.0

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Add-ons

Welcome to Thunderbird Add-ons.

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WarnAttachment 2.21

by Jens Dede

About this Add-on

Version Information

Version 2.21 Released Oct. 31, 2026 32.4 KiB Works with Thunderbird 126.0 - 160.*

Add-ons

Welcome to Thunderbird Add-ons.

On the go?

WarnAttachment 2.21

by Jens Dede

About this Add-on

Version Information

Version 2.21 Released Oct. 31, 2026 32.4 KiB Works with Thunderbird 126.0 - 160.*

Permissions

This add-on can:

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